28 results on '"Camblor, Miguel A."'
Search Results
2. Diets for inflammatory bowel disease: What do we know so far?
- Author
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Serrano-Moreno, Clara, Brox-Torrecilla, Noemi, Arhip, Loredana, Romero, Inmaculada, Morales, Ángela, Carrascal, M. Luisa, Cuerda, Cristina, Motilla, Marta, Camblor, Miguel, Velasco, Cristina, and Bretón, Irene
- Published
- 2022
- Full Text
- View/download PDF
3. [Dataset] Interchain Expanded Extra-Large Pore Zeolites
- Author
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Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), National Natural Science Foundation of China, National Key Research and Development Program (China), Junta de Andalucía, European Commission, Gobierno de Aragón, Camblor, Miguel Ángel [0000-0001-9591-3432], Gao, Zihao Rei, Yu, Huajian, Chen, Fei-Jian, Mayoral, Álvaro, Niu, Zijian, Niu, Ziwen, Li, Xintong, Deng, Hua, Márquez Álvarez, Carlos, He, Hong, Xu, Shutao, Zhou, Yida, Xu, Jun, Xu, Hao, Fan, Wei, Balestra, Salvador R. G., Ma, Chao, Hao, Jiazheng, Li, Jian, Wu, Peng, Yu, Jihong, Camblor, Miguel Ángel, Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), National Natural Science Foundation of China, National Key Research and Development Program (China), Junta de Andalucía, European Commission, Gobierno de Aragón, Camblor, Miguel Ángel [0000-0001-9591-3432], Gao, Zihao Rei, Yu, Huajian, Chen, Fei-Jian, Mayoral, Álvaro, Niu, Zijian, Niu, Ziwen, Li, Xintong, Deng, Hua, Márquez Álvarez, Carlos, He, Hong, Xu, Shutao, Zhou, Yida, Xu, Jun, Xu, Hao, Fan, Wei, Balestra, Salvador R. G., Ma, Chao, Hao, Jiazheng, Li, Jian, Wu, Peng, Yu, Jihong, and Camblor, Miguel Ángel
- Abstract
[EN] 1. Description of methods used for collection/generation of data: Diffraction (electron, synchrotron X-ray, neutron). Infrared spectroscopy multinuclear MAS NMR gas adsorption electron paramagnetic resonance DFT calculations Catalytic reaction 2. Methods for processing the data: Those needed depending on the type of data (SHELX, Rietveld refinement, fast Fourier Transform...). Please, check the paper.
- Published
- 2024
4. Mechanism of the Low-Temperature Organic Removal from Imidazolium-Containing Zeolites by Ozone Treatment: Fluoride Retention in Double-4-Rings.
- Author
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Gao, Zihao Rei, Márquez-Álvarez, Carlos, Balestra, Salvador R. G., Yu, Huajian, Villaescusa, Luis A., and Camblor, Miguel A.
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- 2024
- Full Text
- View/download PDF
5. Fluoride Retention During Low Temperature Organic Removal from Imidazolium-Containing Zeolites by Ozone Treatment
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Gao, Zihao Rei, primary, Márquez Álvarez, Carlos, additional, Balestra, Salvador R. G., additional, Yu, Huajian, additional, Villaescusa, Luis A., additional, and Camblor, Miguel, additional
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- 2024
- Full Text
- View/download PDF
6. 2-Isopropyl-1,3-dimethylimidazolium as a versatile structure-directing agent in the synthesis of zeolites.
- Author
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Yu, Huajian, Rojas, Alex, Gao, Zihao Rei, Gómez-Hortigüela, Luis, Villaescusa, Luis A., Li, Jian, Paillaud, Jean-Louis, and Camblor, Miguel A.
- Subjects
X-ray powder diffraction ,RIETVELD refinement ,MOLE fraction ,DIFFRACTION patterns ,ZEOLITES - Abstract
An organic cation lacking specificity in its structure-directing action offers the possibility, through the screening of other structure-directing parameters, to synthesize a variety of zeolites. In this work we show that the organic structure-directing agent 2-isopropyl-1,3-dimethylimidazolium (2iPr13DMI) can produce up to seven different zeolite phases depending on water concentration, the presence of inorganic impurities, crystallization temperature and time, and germanium molar fraction. The obtained phases are very different in terms of pore system, connectivity of the zeolite structure and structural units. At the pure SiO
2 side, ZSM-12 and SSZ-35 dominate, with ZSM-12 being favored by the presence of potassium impurities and by less concentrated conditions. The introduction of Ge at low levels favors SSZ-35 over ZSM-12 and as the Ge fraction increases it successively affords CSV, -CLO and two distinct UOS zeolites, HPM-11 and HPM-6. These two zeolites have the same topology but distinct chemical compositions and display powder X-ray diffraction patterns that are much different from each other and from that of as-synthesized IM-16 (UOS reference material). They also show different symmetry at 96 K. Rietveld refinements of the three as-made UOS materials mentioned are provided. HPM-6 and HPM-11 are produced in distinct, non-adjacent crystallization fields. The frequent cocrystallization of the chiral STW zeolite, however, did not afford its synthesis as a pure phase. Molecular mechanics simulations of the location of the organic cation and host–guest interactions fail to explain the observed trends, but also considering the intrinsic stability of the zeolites and the effect of germanium help to rationalize the results. The study is completed by DFT calculations of the NMR chemical shifts of13 C in UOS (helping to understand splittings in the spectrum) and19 F in CSV (supporting the location of fluoride inside the new [44 52 ], which is an incomplete double 4-ring). [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
7. Dication Containing Three Aromatic Ring Structure-Directs toward a Chiral Zeolite, Spans Three Cavities, and Effectively Traps Water
- Author
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Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Balestra, Salvador R. G. [0000-0002-2163-2782], Gómez-Hortigüela Sainz, Luis [0000-0002-4960-8709], Li, Jian [0000-0003-2221-2285], Márquez Álvarez, Carlos [0000-0003-2749-4269], Camblor, Miguel Ángel [0000-0001-9591-3432], Gao, Zihao Rei [0000-0003-0331-3515], Gao, Zihao Rei, Balestra, Salvador R. G., Gómez-Hortigüela Sainz, Luis, Li, Jian, Márquez Álvarez, Carlos, Camblor, Miguel Ángel, Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Balestra, Salvador R. G. [0000-0002-2163-2782], Gómez-Hortigüela Sainz, Luis [0000-0002-4960-8709], Li, Jian [0000-0003-2221-2285], Márquez Álvarez, Carlos [0000-0003-2749-4269], Camblor, Miguel Ángel [0000-0001-9591-3432], Gao, Zihao Rei [0000-0003-0331-3515], Gao, Zihao Rei, Balestra, Salvador R. G., Gómez-Hortigüela Sainz, Luis, Li, Jian, Márquez Álvarez, Carlos, and Camblor, Miguel Ángel
- Abstract
[EN] The chiral zeolite STW has been synthesized using a large dication containing three aromatic rings (two imidazolium moieties plus a benzene one). The integrity of the occluded organics is proven by 1H and 13C liquid NMR of the zeolite dissolved in HF/D2O. Molecular simulations strongly suggest that each aromatic ring is located in a different cavity so that each dication crosses two medium pore 10-membered-ring (MR) windows. This is confirmed by Rietveld refinement against synchrotron powder X-ray diffraction data, which suggests that there is also trapped water in the cavities, explaining a significant excess of H found in this material. The presence of water is very soundly confirmed by Fourier-transform infrared experiments, which also show that this water cannot leave the zeolite even after heating at 180 °C under vacuum. Molecular simulations allow us to conclude that this is due to the blockage of the 10 and 8MR windows by the occluded organics. The peculiar situation of an organic structure-directing agent spanning three cavities has important implications for the structure-direction concept that are briefly discussed. Several chiral derivatives of this dication have also been studied, and their possibility to enantioselectively direct the crystallization of STW has been analyzed.
- Published
- 2022
8. A 3D extra-large-pore zeolite enabled by 1D-to-3D topotactic condensation of a chain silicate
- Author
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Li, Jian, Gao, Zihao Rei, Lin, Qing-Fang, Liu, Chenxu, Gao, Fangxin, Lin, Cong, Zhang, Siyao, Deng, Hua, Mayoral, Alvaro, Fan, Wei, Luo, Song, Chen, Xiaobo, He, Hong, Camblor, Miguel A., Chen, Fei-Jian, Yu, Jihong, Li, Jian, Gao, Zihao Rei, Lin, Qing-Fang, Liu, Chenxu, Gao, Fangxin, Lin, Cong, Zhang, Siyao, Deng, Hua, Mayoral, Alvaro, Fan, Wei, Luo, Song, Chen, Xiaobo, He, Hong, Camblor, Miguel A., Chen, Fei-Jian, and Yu, Jihong
- Abstract
Zeolites are microporous silicates with a large variety of applications as catalysts, adsorbents, and cation exchangers. Stable silica-based zeolites with increased porosity are in demand to allow adsorption and processing of large molecules but challenge our synthetic ability. We report a new, highly stable pure silica zeolite called ZEO-3, which has a multidimensional, interconnected system of extra-large pores open through windows made by 16 and 14 silicate tetrahedra, the least dense polymorph of silica known so far. This zeolite was formed by an unprecedented one-dimensional to three-dimensional (1D-to-3D) topotactic condensation of a chain silicate. With a specific surface area of more than 1000 square meters per gram, ZEO-3 showed a high performance for volatile organic compound abatement and recovery compared with other zeolites and metal-organic frameworks.
- Published
- 2023
- Full Text
- View/download PDF
9. 2-Isopropyl-1,3-dimethylimidazolium as a versatile structure-directing agent in the synthesis of zeolites
- Author
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Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Generalitat Valenciana, Yu, Huajian, Rojas, Álex, Gao, Zihao Rei, Gómez-Hortigüela Sainz, Luis, Villaescusa, Luis A., Li, Jian, Paillaud, Jean-Louis, Camblor, Miguel Ángel, Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Generalitat Valenciana, Yu, Huajian, Rojas, Álex, Gao, Zihao Rei, Gómez-Hortigüela Sainz, Luis, Villaescusa, Luis A., Li, Jian, Paillaud, Jean-Louis, and Camblor, Miguel Ángel
- Abstract
[EN] An organic cation lacking specificity in its structure-directing action offers the possibility, through the screening of other structure-directing parameters, to synthesize a variety of zeolites. In this work we show that the organic structure-directing agent 2-isopropyl-1,3-dimethylimidazolium (2iPr13DMI) can produce up to seven different zeolite phases depending on water concentration, the presence of inorganic impurities, crystallization temperature and time, and germanium molar fraction. The obtained phases are very different in terms of pore system, connectivity of the zeolite structure and structural units. At the pure SiO2 side, ZSM-12 and SSZ-35 dominate, with ZSM-12 being favored by the presence of potassium impurities and by less concentrated conditions. The introduction of Ge at low levels favors SSZ-35 over ZSM-12 and as the Ge fraction increases it successively affords CSV, -CLO and two distinct UOS zeolites, HPM-11 and HPM-6. These two zeolites have the same topology but distinct chemical compositions and display powder X-ray diffraction patterns that are much different from each other and from that of as-synthesized IM-16 (UOS reference material). They also show different symmetry at 96 K. Rietveld refinements of the three as-made UOS materials mentioned are provided. HPM-6 and HPM-11 are produced in distinct, non-adjacent crystallization fields. The frequent cocrystallization of the chiral STW zeolite, however, did not afford its synthesis as a pure phase. Molecular mechanics simulations of the location of the organic cation and host–guest interactions fail to explain the observed trends, but also considering the intrinsic stability of the zeolites and the effect of germanium help to rationalize the results. The study is completed by DFT calculations of the NMR chemical shifts of 13C in UOS (helping to understand splittings in the spectrum) and 19F in CSV (supporting the location of fluoride inside the new [4452], which is an incomplete double 4
- Published
- 2023
10. A 3D extra-large-pore zeolite enabled by 1D-to-3Dtopotactic condensation of a chain silicate
- Author
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National Natural Science Foundation of China, National Key Research and Development Program (China), Anhui Province, Ministerio de Ciencia e Innovación (España), Knut and Alice Wallenberg Foundation, European Commission, Department of Energy (US), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Diputación General de Aragón, Gobierno de Aragón, Li, Jian, Gao, Zihao Rei, Lin, Qing-Fang, Liu, Chenxu, Gao, Fangxin, Lin, Cong, Zhang, Siyao, Deng, Hua, Mayoral, Álvaro, Fan, Wei, Luo, Song, Chen, Xiaobo, He, Hong, Camblor, Miguel Ángel, Chen, Fei-Jian, Yu, Jihong, National Natural Science Foundation of China, National Key Research and Development Program (China), Anhui Province, Ministerio de Ciencia e Innovación (España), Knut and Alice Wallenberg Foundation, European Commission, Department of Energy (US), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Diputación General de Aragón, Gobierno de Aragón, Li, Jian, Gao, Zihao Rei, Lin, Qing-Fang, Liu, Chenxu, Gao, Fangxin, Lin, Cong, Zhang, Siyao, Deng, Hua, Mayoral, Álvaro, Fan, Wei, Luo, Song, Chen, Xiaobo, He, Hong, Camblor, Miguel Ángel, Chen, Fei-Jian, and Yu, Jihong
- Abstract
Zeolites are microporous silicates with a large variety of applications as catalysts, adsorbents, and cationexchangers. Stable silica-based zeolites with increased porosity are in demand to allow adsorption andprocessing of large molecules but challenge our synthetic ability. We report a new, highly stable pure silicazeolite called ZEO-3, which has a multidimensional, interconnected system of extra-large pores open throughwindows made by 16 and 14 silicate tetrahedra, the least dense polymorph of silica known so far. This zeolitewas formed by an unprecedented one-dimensional to three-dimensional (1D-to-3D) topotactic condensationof a chain silicate. With a specific surface area of more than 1000 square meters per gram, ZEO-3 showed ahigh performance for volatile organic compound abatement and recovery compared with other zeolites andmetal-organic frameworks.
- Published
- 2023
11. A 3D extra-large-pore zeolite enabled by 1D-to-3D topotactic condensation of a chain silicate
- Author
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Li, Jian, primary, Gao, Zihao Rei, additional, Lin, Qing-Fang, additional, Liu, Chenxu, additional, Gao, Fangxin, additional, Lin, Cong, additional, Zhang, Siyao, additional, Deng, Hua, additional, Mayoral, Alvaro, additional, Fan, Wei, additional, Luo, Song, additional, Chen, Xiaobo, additional, He, Hong, additional, Camblor, Miguel A., additional, Chen, Fei-Jian, additional, and Yu, Jihong, additional
- Published
- 2023
- Full Text
- View/download PDF
12. A 3D Extra-Large Pore Zeolite Enabled by 1D-to-3D Topotactic Condensation of a Chain Silicate
- Author
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Li, Jian, primary, Gao, Zihao Rei, additional, Lin, Qing-Fang, additional, Liu, Chenxu, additional, Gao, Fangxin, additional, Lin, Cong, additional, Zhang, Siyao, additional, Deng, Hua, additional, Mayoral, Alvaro, additional, Fan, Wei, additional, Luo, Song, additional, Chen, Xiaobo, additional, He, Hong, additional, Camblor, Miguel A., additional, Chen, Fei-Jian, additional, and Yu, Jihong, additional
- Published
- 2022
- Full Text
- View/download PDF
13. Implementation of a parenteral nutrition home care programme in a tertiary hospital.
- Author
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Arhip, Loredana, Camblor, Miguel, Bretón, Irene, Motilla, Marta, Serrano-Moreno, Clara, María Romero, Rosa, Lobato, Elena, Frías, Laura, Velasco, Cristina, Luisa Carrascal, María, and Cuerda, Cristina
- Subjects
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PARENTERAL feeding , *NURSING care facilities , *MALE nurses , *HOSPITAL personnel , *TERTIARY care , *INVENTORY control , *TELEPHONE calls - Abstract
Aim: the objective of this study was to describe the results of the implementation of a home parenteral nutrition (HPN) care programme (Nutrihome©) in a cohort of patients treated at a tertiary hospital. Methods: retrospective study of the patients included in Nutrihome© at Hospital General Universitario Gregorio Marañón, Madrid, Spain. Nutrihome consists of different modules including pre-discharge nursing hospital visits and nursing home visits, deliveries of the infusion pump, consumables and parenteral nutrition bags, patient training, weekly scheduled nursing home visits, scheduled nursing phone calls, stock control phone calls and 24-hour on-call line manned by the nurses. Results: the study included 8 (75 % women) and 10 (70 % women) patients in the Nutrihome© pilot and Nutrihome© programme, respectively. A total 37 adverse events were reported during Nutrihome© pilot, 26 of which were technical, 9 clinical, 1 was catheter-related and 1 other event. Nutrihome© programme registered a total of 107 adverse events reported, 57 of which were technical, 21 clinical, 16 were catheter-related and 13 were other events. A total of 99 % of these events were solved by Nutrihome© via phone calls or home visits. Conclusions: Nutrihome© programme has been extremely useful during this pandemic, facilitating both the start of HPN and training at the patient home without the need for hospitalisation. Additionally, the adverse events reported and solved by Nutrihome© not only reduced the physicians’ burden during those tough times and the patients´ stress of being hospitalised during a pandemic, but supported the entire healthcare system. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
14. Dication Containing Three Aromatic Ring Structure-Directs toward a Chiral Zeolite, Spans Three Cavities, and Effectively Traps Water
- Author
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Gao, Zihao Rei, Balestra, Salvador R. G., Gómez-Hortigüela, Luis, Li, Jian, Márquez-Alvarez, Carlos, Camblor, Miguel A., Gao, Zihao Rei, Balestra, Salvador R. G., Gómez-Hortigüela, Luis, Li, Jian, Márquez-Alvarez, Carlos, and Camblor, Miguel A.
- Abstract
The chiral zeolite STW has been synthesized using a large dication containing three aromatic rings (two imidazolium moieties plus a benzene one). The integrity of the occluded organics is proven by 1H and 13C liquid NMR of the zeolite dissolved in HF/D2O. Molecular simulations strongly suggest that each aromatic ring is located in a different cavity so that each dication crosses two medium pore 10-membered-ring (MR) windows. This is confirmed by Rietveld refinement against synchrotron powder X-ray diffraction data, which suggests that there is also trapped water in the cavities, explaining a significant excess of H found in this material. The presence of water is very soundly confirmed by Fourier-transform infrared experiments, which also show that this water cannot leave the zeolite even after heating at 180 °C under vacuum. Molecular simulations allow us to conclude that this is due to the blockage of the 10 and 8MR windows by the occluded organics. The peculiar situation of an organic structure-directing agent spanning three cavities has important implications for the structure-direction concept that are briefly discussed. Several chiral derivatives of this dication have also been studied, and their possibility to enantioselectively direct the crystallization of STW has been analyzed.
- Published
- 2022
- Full Text
- View/download PDF
15. Tweaking Structure Direction to Synthesize New Zeolites
- Author
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Camblor, Miguel Ángel, Consejo Superior de Investigaciones Científicas (España), Universidad Autónoma de Madrid, Gao, Zihao Rei, Camblor, Miguel Ángel, Consejo Superior de Investigaciones Científicas (España), Universidad Autónoma de Madrid, and Gao, Zihao Rei
- Abstract
[EN] Zeolites are a type of microporous materials with a wide range of industrial applications including adsorption, separation, catalysis, etc., because of the ordered micropores and high thermal/hydrothermal stability. Zeolites with new topologies and novel channel systems might provide possibilities for new applications and/or possess better performance as adsorbents or catalysts. Using organic structure-directing agents (OSDA) has already become a general strategy in zeolite synthesis, especially in discovering the new zeolite phases. This can be combined with other structure-direction factors (heteroatom nature and molar fraction, gel concentration, use of fluoride) in the search for new zeolites. Synthetic zeolites, rather than natural zeolites, have become the backbone of the current chemical industry, where the OSDAs are essential for those synthetic zeolites. In this thesis, we focused our research interest on the synthesis of zeolites with novel structures and the associated modifications of the zeolites we obtained. For the discovery of new zeolites, we combined several structure directing effects, such as several OSDAs and ISDAs (Ge and F) and the effect of the gel concentration., [ES] Las zeolitas son un tipo de materiales microporosos con una amplia gama de aplicaciones industriales que incluyen adsorción, separación, catálisis, etc., debido a los microporos ordenados y la alta estabilidad térmica / hidrotermal. Las zeolitas con nuevas topologías y nuevos sistemas de canales podrían proporcionar posibilidades para nuevas aplicaciones y/o poseer un mejor rendimiento como adsorbentes o catalizadores. El uso de agentes orgánicos directores de estructura (OSDA) ya se ha convertido en una estrategia general en la síntesis de zeolita, especialmente en el descubrimiento de nuevas fases zeolíticas. Esto se puede combinar con otros factores de dirección de estructura (naturaleza de los heteroátomos y su fracción molar, concentración de gel, uso de fluoruro) en la búsqueda de nuevas zeolitas. Las zeolitas sintéticas, en lugar de las zeolitas naturales, se han convertido en la columna vertebral de la industria química actual, donde los OSDA son esenciales para esas zeolitas sintéticas. En esta tesis, centramos nuestro interés investigador en la síntesis de zeolitas con estructuras novedosas y en modificaciones de las zeolitas obtenidas. Para el descubrimiento de nuevas zeolitas, combinamos varios efectos de dirección de estructura, como varios OSDAs e ISDAs (Ge y F) y el efecto de la concentración del gel.
- Published
- 2022
16. An Extra-Large Pore Zeolite Enabled by 1D-to-3D Topotactic Condensation
- Author
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Li, Jian, primary, Gao, Zihao Rei, additional, Lin, Qing-Fang, additional, Liu, Chenxu, additional, Gao, Fangxin, additional, Lin, Cong, additional, Zhang, Siyao, additional, Deng, Hua, additional, Mayoral, Alvaro, additional, Fan, Wei, additional, Luo, Song, additional, Chen, Xiaobo, additional, Camblor, Miguel A., additional, Chen, Fei-Jian, additional, and Yu, Jihong, additional
- Published
- 2022
- Full Text
- View/download PDF
17. Dication Containing Three Aromatic Ring Structure-Directs toward a Chiral Zeolite, Spans Three Cavities, and Effectively Traps Water
- Author
-
Gao, Zihao Rei, primary, Balestra, Salvador R. G., additional, Gómez-Hortigüela, Luis, additional, Li, Jian, additional, Márquez-Alvarez, Carlos, additional, and Camblor, Miguel A., additional
- Published
- 2022
- Full Text
- View/download PDF
18. A stable aluminosilicate zeolite with intersecting three-dimensional extra-large pores
- Author
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Lin, Qing-Fang, primary, Gao, Zihao Rei, additional, Lin, Cong, additional, Zhang, Siyao, additional, Chen, Junfeng, additional, Li, Zhiqiang, additional, Liu, Xiaolong, additional, Fan, Wei, additional, Li, Jian, additional, Chen, Xiaobo, additional, Camblor, Miguel A., additional, and Chen, Fei-Jian, additional
- Published
- 2021
- Full Text
- View/download PDF
19. Synthesis of Extra‐Large Pore, Large Pore and Medium Pore Zeolites Using a Small Imidazolium Cation as the Organic Structure‐Directing Agent
- Author
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Gao, Zihao Rei, primary, Balestra, Salvador R. G., additional, Li, Jian, additional, and Camblor, Miguel A., additional
- Published
- 2021
- Full Text
- View/download PDF
20. A 3D extra-large-pore zeolite enabled by 1D-to-3D topotactic condensation of a chain silicate.
- Author
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Jian Li, Zihao Rei Gao, Qing-Fang Lin, Chenxu Liu, Fangxin Gao, Cong Lin, Siyao Zhang, Hua Deng, Mayoral, Alvaro, Wei Fan, Song Luo, Xiaobo Chen, Hong He, Camblor, Miguel A., Fei-Jian Chen, and Jihong Yu
- Published
- 2023
- Full Text
- View/download PDF
21. Sandwich-Type Zeolite Intergrowths with MFI and the Novel Extra-Large Pore IDM-1 as Ordered End-Members
- Author
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Villaescusa, Luis A., Li, Jian, Mayoral, Alvaro, Gao, Zihao Rei, and Camblor, Miguel A.
- Abstract
Stacking faults are two-dimensional planar defects frequently arising in zeolites, modifying their properties and potentially affecting their performance in catalysis and separation applications. In classical zeolite intergrowths, a topologically unique zeolite layer may often pile up after some spatial transformation (lateral translation, rotation, and/or reflection) that may occur in different amounts or directions with about similar probabilities, leading to a difficult to control disorder. Here, we present a new kind of zeolite intergrowth that requires an additional topologically distinct layer rather than a spatial transformation of a unique one. Stacking of the so-called pentasil layers produces the well-known medium pore zeolite MFI. Intercalation in strict alternation of a topologically distinct second layer sandwiched between pentasil layers expands the structure to produce the new extra-large pore IDM-1. Stacking disorder modulates the structural expansion along the stacking direction. The disordered materials have been studied by simulation of the X-ray diffraction patterns using the program DIFFaX and by Cs-corrected high-resolution electron microscopy. We show that disorder does not occur at random but in extended domains and can be controlled all the way from MFI to IDM-1 by just varying the concentration of the synthesis mixture.
- Published
- 2021
- Full Text
- View/download PDF
22. Two pregnancies of an ornithine carbamoyltransferase deficiency disease carrier and review of the literature.
- Author
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Arhip, Loredana, Agreda, Javier, Serrano-Moreno, Clara, Motilla, Marta, Carrascal, Maria Luisa, Bielza, Atocha, Velasco, Cristina, Camblor, Miguel, Bretón, Irene, and Cuerda, Cristina
- Subjects
- *
LITERATURE reviews , *DISEASE vectors , *DEFICIENCY diseases , *PUERPERIUM , *PARTURITION , *ORNITHINE , *PREGNANCY , *X chromosome - Abstract
Background: the underlying cause of the deficiency of ornithine carbamoyltransferase (OTCD) is a gene mutation on the X chromosome. In females, the phenotype is highly variable, ranging from asymptomatic to neurologic compromise secondary to hyperammonemia and it can be prompted by numerous triggers, including pregnancy. Objective: the objective of this article is to report a case of two pregnancies of an OTCD-carrier, and to review the literature describing OTCD and pregnancy, parturition and postpartum. Methods: an extensive search in PubMed in December 2021 was conducted using different search terms. After screening all abstracts, 23 papers that corresponded to our inclusion criteria were identified. Results: the article focuses on the management of OTCD during pregnancy, parturition, and the postpartum period in terms of clinical presentation, ammonia levels and treatment. Conclusions: females with OTCD can certainly plan a pregnancy, but they need a careful management during delivery and particularly during the immediate postpartum period. If possible, a multidisciplinary team of physicians, dietitians, obstetrician-gynecologist, neonatologists, pharmacists, etc. with expertise in this field should participate in the care of women with OTCD and their children during this period and in their adult life. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
23. A stable aluminosilicate zeolite with intersecting three-dimensional extra-large pores
- Author
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Qing-Fang Lin, Zihao Rei Gao, Cong Lin, Siyao Zhang, Junfeng Chen, Zhiqiang Li, Xiaolong Liu, Wei Fan, Jian Li, Xiaobo Chen, Miguel A. Camblor, Fei-Jian Chen, National Natural Science Foundation of China, Ministerio de Ciencia, Innovación y Universidades (España), Swedish Research Council, Knut and Alice Wallenberg Foundation, Lin, Qing-Fang [0000-0001-9057-5091], Gao, Zihao Rei [0000-0003-0331-3515], Lin, Cong [0000-0003-0021-5055], Fan, Wei [0000-0002-8581-2651], Li, Jian [0000-0003-2221-2285], Chen, Xiaobo [0000-0001-9180-0190], Camblor, Miguel Ángel [0000-0001-9591-3432], Chen, Fei-Jian [0000-0001-9345-9459], Lin, Qing-Fang, Gao, Zihao Rei, Lin, Cong, Fan, Wei, Li, Jian, Chen, Xiaobo, Camblor, Miguel Ángel, and Chen, Fei-Jian
- Subjects
Multidisciplinary ,Crystalline porous materials ,Zeolites - Abstract
Anyone can then access the published paper FREE OF CHARGE by clicking on this link. Cualquier persona puede acceder al documento publicado de forma GRATUITA, accediendo a través del enlace: https://www.science.org/stoken/author-tokens/ST-242/full, [EN] Zeolites are crystalline porous materials with important industrial applications, including uses in catalytic and adsorption-separation processes. Access into and out of their inner confined space, where adsorption and reactions occur, is limited by their pore apertures. Stable multidimensional zeolites with larger pores able to process larger molecules are in demand in the fine chemical industry and for the oil processing on which the world still relies for fuels. Currently known extra-large-pore zeolites display poor stability and/or lack pore multidimensionality, limiting their usefulness. We report ZEO-1, a robust, fully connected aluminosilicate zeolite with mutually intersecting three-dimensional extra-large plus three-dimensional large pores. ZEO-1 is stable up to 1000°C, has an extraordinary specific surface area (1000 square meters per gram), and shows potential as a catalytic cracking catalys., National Natural Science Foundation of China (grant numbers: 21601004, 21776312, 22078364), the Natural Science Foundation of the Higher Education Institutions of Anhui Province, China (grant numbers: KJ2020A0585), and the Spanish Ministry of Science Innovation and Universities (MICIU) (PID2019-105479RB-I00 project, AEI, Spain and FEDER, EU). The cRED data was collected at the Electron Microscopy Center (EMC), Department of Materials and Environmental Chemistry (MMK) in Stockholm University with the support of the Swedish Research Council (Grant No. 1444205) and the Knut and Alice Wallenberg Foundation (KAW, 2012-0112) through the 3DEM-NATUR project. Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. W.F. gratefully acknowledges support from the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, under Award # DE-SC0019170.
- Published
- 2021
24. Dication Containing Three Aromatic Ring Structure-Directs toward a Chiral Zeolite, Spans Three Cavities, and Effectively Traps Water
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Zihao Rei Gao, Salvador R. G. Balestra, Luis Gómez-Hortigüela, Jian Li, Carlos Márquez-Alvarez, Miguel A. Camblor, Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Balestra, Salvador R. G., Gómez-Hortigüela Sainz, Luis, Li, Jian, Márquez Álvarez, Carlos, Camblor, Miguel Ángel, Gao, Zihao Rei, Balestra, Salvador R. G. [0000-0002-2163-2782], Gómez-Hortigüela Sainz, Luis [0000-0002-4960-8709], Li, Jian [0000-0003-2221-2285], Márquez Álvarez, Carlos [0000-0003-2749-4269], Camblor, Miguel Ángel [0000-0001-9591-3432], and Gao, Zihao Rei [0000-0003-0331-3515]
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General Chemical Engineering ,Cations ,Materials Chemistry ,Imidazolium ,Zeolites ,General Chemistry ,Cavities ,Molecular structure - Abstract
[EN] The chiral zeolite STW has been synthesized using a large dication containing three aromatic rings (two imidazolium moieties plus a benzene one). The integrity of the occluded organics is proven by 1H and 13C liquid NMR of the zeolite dissolved in HF/D2O. Molecular simulations strongly suggest that each aromatic ring is located in a different cavity so that each dication crosses two medium pore 10-membered-ring (MR) windows. This is confirmed by Rietveld refinement against synchrotron powder X-ray diffraction data, which suggests that there is also trapped water in the cavities, explaining a significant excess of H found in this material. The presence of water is very soundly confirmed by Fourier-transform infrared experiments, which also show that this water cannot leave the zeolite even after heating at 180 °C under vacuum. Molecular simulations allow us to conclude that this is due to the blockage of the 10 and 8MR windows by the occluded organics. The peculiar situation of an organic structure-directing agent spanning three cavities has important implications for the structure-direction concept that are briefly discussed. Several chiral derivatives of this dication have also been studied, and their possibility to enantioselectively direct the crystallization of STW has been analyzed., This article is part of projects PID2019-105479RB-I00 and PID2019-107968RB-I00 funded by MCIN/AEI/10.13039/501100011033, Spain. S.R.G.B. was supported by grant FJC2018-035697-I funded by MCIN/AEI/10.13039/501100011033. Centro Técnico Informático-CSIC, Trueno, and CESGA (Supercomputing Center of Galicia) cluster facilities are acknowledged for running the calculations. OpenAccess funding is provided by CSIC.
- Published
- 2022
25. Tweaking Structure Direction to Synthesize New Zeolites
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Gao, Zihao Rei, Camblor, Miguel Ángel, Consejo Superior de Investigaciones Científicas (España), and Universidad Autónoma de Madrid
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Zeolite ,Zeolitas ,Zeolite Syntheses ,Síntesis de zeolitas - Abstract
Tesis compuesta por los siguiente artículos publicados: HPM-14, a New Germanosilicate Zeolite with Interconnected Extra-Large Pores Plus Odd-Membered and Small Pores (http://hdl.handle.net/10261/250857) HPM-16, a Stable Interrupted Zeolite with a Multidimensional Mixed Medium-Large Pore System Containing Supercages (http://hdl.handle.net/10261/250837) Synthesis of Extra-Large Pore, Large Pore and Medium Pore Zeolites Using a Small Imidazolium Cation as the Organic Structure-Directing Agent (http://hdl.handle.net/10261/269442) A Dication Containing Three Aromatic Rings Structure Directs Towards a Chiral Zeolite, Spans Three Cavities and Effectively Traps Water (http://hdl.handle.net/10261/269470), [EN] Zeolites are a type of microporous materials with a wide range of industrial applications including adsorption, separation, catalysis, etc., because of the ordered micropores and high thermal/hydrothermal stability. Zeolites with new topologies and novel channel systems might provide possibilities for new applications and/or possess better performance as adsorbents or catalysts. Using organic structure-directing agents (OSDA) has already become a general strategy in zeolite synthesis, especially in discovering the new zeolite phases. This can be combined with other structure-direction factors (heteroatom nature and molar fraction, gel concentration, use of fluoride) in the search for new zeolites. Synthetic zeolites, rather than natural zeolites, have become the backbone of the current chemical industry, where the OSDAs are essential for those synthetic zeolites. In this thesis, we focused our research interest on the synthesis of zeolites with novel structures and the associated modifications of the zeolites we obtained. For the discovery of new zeolites, we combined several structure directing effects, such as several OSDAs and ISDAs (Ge and F) and the effect of the gel concentration., [ES] Las zeolitas son un tipo de materiales microporosos con una amplia gama de aplicaciones industriales que incluyen adsorción, separación, catálisis, etc., debido a los microporos ordenados y la alta estabilidad térmica / hidrotermal. Las zeolitas con nuevas topologías y nuevos sistemas de canales podrían proporcionar posibilidades para nuevas aplicaciones y/o poseer un mejor rendimiento como adsorbentes o catalizadores. El uso de agentes orgánicos directores de estructura (OSDA) ya se ha convertido en una estrategia general en la síntesis de zeolita, especialmente en el descubrimiento de nuevas fases zeolíticas. Esto se puede combinar con otros factores de dirección de estructura (naturaleza de los heteroátomos y su fracción molar, concentración de gel, uso de fluoruro) en la búsqueda de nuevas zeolitas. Las zeolitas sintéticas, en lugar de las zeolitas naturales, se han convertido en la columna vertebral de la industria química actual, donde los OSDA son esenciales para esas zeolitas sintéticas. En esta tesis, centramos nuestro interés investigador en la síntesis de zeolitas con estructuras novedosas y en modificaciones de las zeolitas obtenidas. Para el descubrimiento de nuevas zeolitas, combinamos varios efectos de dirección de estructura, como varios OSDAs e ISDAs (Ge y F) y el efecto de la concentración del gel.
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- 2022
26. Stable Silica-Based Zeolites with Three-Dimensional Systems of Extra-Large Pores.
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Camblor MA, Gao ZR, Yu H, and Villaescusa LA
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Zeolites are microporous crystalline materials that find a very wide range of applications, which, however, are limited by the size and dimensionality of their pores. Stable silica zeolites with a three-dimensional (3D) system of extra-large pores (ELP, i.e., pores with minimum windows along the diffusion path consisting of more than 12 SiO4/2 tetrahedra, 12R) are in demand for processing larger molecules than zeolites can currently handle. However, they have challenged worldwide synthetic capabilities for more than eight decades. In this review we first present a brief history of the discovery of ELP zeolites. Next, we show that earlier successes of zeolites with 3D ELP were not actually zeolites, but rather interrupted structures with, in addition, a composition that severely detracted from their stability. Finally, we present three new fully connected stable silica-based 3D ELP zeolites ZEO-1, ZEO-3 and ZEO-5, discuss their preparation methods and stability as well as the clear advantage of their increased porosity in catalysis and adsorption processes involving large molecules. We will discuss peculiar characteristics of their preparation and present two new reaction types giving rise to zeolites (1D-to-3D topotactic condensation and interchain expansion), highlighting how new synthesis methods can provide materials that would otherwise be unfeasible., (© 2024 Wiley‐VCH GmbH.)
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- 2024
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27. 2-Isopropyl-1,3-dimethylimidazolium as a versatile structure-directing agent in the synthesis of zeolites.
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Yu H, Rojas A, Gao ZR, Gómez-Hortigüela L, Villaescusa LA, Li J, Paillaud JL, and Camblor MA
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An organic cation lacking specificity in its structure-directing action offers the possibility, through the screening of other structure-directing parameters, to synthesize a variety of zeolites. In this work we show that the organic structure-directing agent 2-isopropyl-1,3-dimethylimidazolium (2iPr13DMI) can produce up to seven different zeolite phases depending on water concentration, the presence of inorganic impurities, crystallization temperature and time, and germanium molar fraction. The obtained phases are very different in terms of pore system, connectivity of the zeolite structure and structural units. At the pure SiO
2 side, ZSM-12 and SSZ-35 dominate, with ZSM-12 being favored by the presence of potassium impurities and by less concentrated conditions. The introduction of Ge at low levels favors SSZ-35 over ZSM-12 and as the Ge fraction increases it successively affords CSV, -CLO and two distinct UOS zeolites, HPM-11 and HPM-6. These two zeolites have the same topology but distinct chemical compositions and display powder X-ray diffraction patterns that are much different from each other and from that of as-synthesized IM-16 (UOS reference material). They also show different symmetry at 96 K. Rietveld refinements of the three as-made UOS materials mentioned are provided. HPM-6 and HPM-11 are produced in distinct, non-adjacent crystallization fields. The frequent cocrystallization of the chiral STW zeolite, however, did not afford its synthesis as a pure phase. Molecular mechanics simulations of the location of the organic cation and host-guest interactions fail to explain the observed trends, but also considering the intrinsic stability of the zeolites and the effect of germanium help to rationalize the results. The study is completed by DFT calculations of the NMR chemical shifts of13 C in UOS (helping to understand splittings in the spectrum) and19 F in CSV (supporting the location of fluoride inside the new [44 52 ], which is an incomplete double 4-ring).- Published
- 2023
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28. Synthesis of Extra-Large Pore, Large Pore and Medium Pore Zeolites Using a Small Imidazolium Cation as the Organic Structure-Directing Agent.
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Gao ZR, Balestra SRG, Li J, and Camblor MA
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One common strategy in the search for new zeolites is the use of organic structure-directing agents (OSDA). Typically, one seeks to achieve a high specificity in the structure-directing effect of the OSDA. This study shows, however, that an OSDA lacking strong specificity towards any particular zeolite may provide opportunities for discovery when other synthesis parameters are systematically screened. Thus, 1-methyl-2-ethyl-3-n-propylimidazolium has allowed to crystallize the new large/medium pore zeolite HPM-16 as well as the recently reported extra-large pore -SYT and the medium/small pore and chiral STW. The sophisticated OSDA originally affording -SYT and the new simple OSDA have very little in common, both in terms of size, shape and flexibility, while both may still direct the synthesis of the same zeolite. In fact, molecular simulations show that the new OSDA is located in three different positions of the -SYT structure, including the discrete 8MR where the original organic could not fit., (© 2021 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH.)
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- 2021
- Full Text
- View/download PDF
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