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8 results on '"Departamento de Ingenieria Quimica, Facultad de Quimica (UNICAT)"'

1. Partially Reversible H 2 S Adsorption by MFM-300(Sc): Formation of Polysulfides

Author

Gregorio Guzmán-González, J Antonio Zárate-Colín, Elí Sánchez-González, Hugo A. Lara-García, Maria Cristina Zorrilla, Vojtech Jancik, Ilich A. Ibarra, Eduardo González-Zamora, Ignacio González, Jorge Ramírez, Guillaume Maurin, Julia Aguilar-Pliego, Aída Gutiérrez-Alejandre, Jorge R Valenzuela, J. Gabriel Flores, Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Universidad Nacional Autónoma de México (UNAM), Institut de Ecologia, inecol, Departamento de Ingenieria Quimica, Facultad de Quimica (UNICAT), UNAM, Departamento de Química Aplicada, Universidad Autónoma Metropolitana Azcapotzalco, Instituto de Física, Departamento de Química, Universidad Autonoma Metropolitana - Iztapalapa, CNRS, Toulouse, France, Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), and Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)

Subjects
Materials science, Hydrogen sulfide, Inorganic chemistry, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Sulfur, 0104 chemical sciences, chemistry.chemical_compound, Adsorption, Physisorption, chemistry, Chemisorption, [CHIM]Chemical Sciences, General Materials Science, Metal-organic framework, Isostructural, 0210 nano-technology, Polysulfide
Abstract

The metal-organic framework (MOF)-type MFM-300(Sc) exhibits a combined physisorption and chemisorption capture of H2S, leading to a high uptake (16.55 mmol g-1) associated with high structural stability. The irreversible chemisorbed sulfur species were identified as low-order polysulfide (n = 2) species. The isostructural MFM-300(In) was demonstrated to promote the formation of different polysulfide species, paving the way toward a new methodology to incorporate polysulfides within MOFs for the generation of novel MOF-lithium/sulfur batteries.

Published
2020

2. Outstanding reversible H 2 S capture by an Al( iii )-based MOF

Author

Ilich A. Ibarra, Eduardo González-Zamora, Aída Gutiérrez-Alejandre, Tamara Jurado-Vázquez, Guillaume Maurin, Ivan Castillo, J. Antonio Zárate, Elí Sánchez-González, Universidad Nacional Autónoma de México (UNAM), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Departamento de Ingenieria Quimica, Facultad de Quimica (UNICAT), UNAM, and Universidad Autonoma Metropolitana - Iztapalapa

Subjects
Materials science, 010405 organic chemistry, Regeneration (biology), Metals and Alloys, General Chemistry, 010402 general chemistry, 01 natural sciences, Catalysis, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Adsorption, Chemical engineering, Materials Chemistry, Ceramics and Composites, [CHIM]Chemical Sciences
Abstract

International audience; The MOF-type MIL-53(Al)-TDC was demonstrated to be an optimal adsorbent for H2S capture combining an unprecedented uptake at room temperature, excellent cyclability and low-temperature regeneration.

Published
2019

3. Highly reversible sorption of H 2 S and CO 2 by an environmentally friendly Mg-based MOF

Author

J. Balmaseda, Guillaume Maurin, Eduardo González-Zamora, Paulo G. M. Mileo, Jorge Ramírez, Ilich A. Ibarra, J. Raziel Álvarez, Joseph E. Reynolds, Elí Sánchez-González, Simon M. Humphrey, Mónica Sagastuy-Breña, Aline Villarreal, Aída Gutiérrez-Alejandre, Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Universidad Nacional Autónoma de México (UNAM), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Departamento de Ingenieria Quimica, Facultad de Quimica (UNICAT), UNAM, Departamento de Química [Mexico], and Universidad Autonoma Metropolitana - Iztapalapa

Subjects
Renewable Energy, Sustainability and the Environment, Chemistry, Industrial gas, Sorption, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Environmentally friendly, 0104 chemical sciences, Crystallinity, Adsorption, Chemical engineering, Acid gas, [CHIM]Chemical Sciences, General Materials Science, Relative humidity, 0210 nano-technology
Abstract

International audience; Mg-CUK-1, an ecologically friendly material synthesised in water is found to be a high-capacity, highly reversible adsorbent for acidic gases including H2S and CO2. Furthermore, Mg-CUK-1 is demonstrated to retain long-range crystallinity upon sorption cycling; its sorption performance is maintained over multiple cycles, even in the presence of high relative humidity (95%). Reversible H2S adsorption by Mg-CUK-1 is rare among MOFs studied for this purpose to date. The joint experimental and computational studies presented here show that Mg-CUK-1 is an effective solid adsorbent for applications in the field of acid gas capture, an application that is highly relevant for the purification of many industrial gas streams.

Published
2018

4. Activity and surface properties of NiMo/SiO2–Al2O3 catalysts for hydroprocessing of heavy oils

Author

Françoise Maugé, Jorge Ramírez, Jorge Ancheyta, Mohan S. Rana, Laurence Mariey, Arnaud Travert, Carolina Leyva, Laboratoire catalyse et spectrochimie (LCS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Departamento de Ingenieria Quimica, Facultad de Quimica (UNICAT), UNAM, and Roland, Pascal

Subjects
Sulfide, Inorganic chemistry, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Catalysis, Adsorption, Physisorption, Hydrotreating, [CHIM] Chemical Sciences, [CHIM]Chemical Sciences, chemistry.chemical_classification, Chemistry, Process Chemistry and Technology, Coke, Heavy oil, 021001 nanoscience & nanotechnology, 0104 chemical sciences, FT-IR, Hydrodenitrogenation, CO adsorption, Mixed oxide, 0210 nano-technology, Hydrodesulfurization, NiMo/SiO2-Al2O3 catalysts
Abstract

International audience; NiMo/SiO2-Al2O3 mixed oxide supported catalysts were investigated for hydroprocessing of heavy crude oil at moderate reaction conditions. Hydrodesulfurization (HDS), hydrodemetalization (HDM), hydrodeasphaltenization (HDAs) and hydrodenitrogenation (HDN) reactions were studied as function of time-on-stream (TOS). The results indicated that HDS of crude oil corresponds to the number of active metal sites (sulfide phases) present in the catalyst, HDN is enhanced when the catalyst presents a combination of well dispersed sulfide phases and weak to moderate acidity. HDM presented a complex behavior indicating that it is affected significantly not only by the dispersion of the sulfide phase but also by the porosity and acidity of the catalyst. As expected, for HDAs both acidity and textural properties are important. The stability of the catalyst with time-on-stream was affected by coke and metals deposition. The supports and fresh catalysts were characterized by nitrogen physisorption, SEM-EDX, and FT-IR of CO and pyridine adsorption. The results confirm that NiMo/SiO2-Al2O3 catalysts are a good option for the hydrotreatment of heavy oils and that the method used here for support preparation can tune the formation of meso- or macro-porosity and the type and strength of the catalyst acid sites. (C) 2012 Elsevier B.V. All rights reserved.

Published
2012

5. HDS of 4,6-DMDBT over NiMoP/(x)Ti-SBA-15 catalysts prepared with H3PMo12O40

Author

Jorge Ramirez, Aida Gutierrez-Alejandre, Felipe Sanchez-Minero, Victor Macias-Alcantara, Perla Castillo-Villalon, Laetitia Oliviero, Francoise Maugé, Departamento de Ingenieria Quimica, Facultad de Quimica (UNICAT), UNAM, Laboratoire catalyse et spectrochimie (LCS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), and Roland, Pascal

Subjects
[CHIM] Chemical Sciences, [CHIM]Chemical Sciences
Abstract

International audience; HDS of 4,6-DMDBT over NiMoP/SBA-15 and NiMoP/(x)TiSBA-15 catalysts prepared using an heteropolyacid (H3PMo12O40) and nickel citrate (C12H10N13O14) as Mo and Ni precursors was studied. To analyze the effect of. calcination temperature on HDS activity, catalysts noncalcined and calcined at 773 K were prepared. The performance of the different catalysts during the hydrodesulfurization of 4,6-dimethyldibenzothiophene was compared with that of a reference catalyst prepared by impregnation with a solution containing ammonium heptamolybdate and nickel nitrate. Kinetic parameters for the HDS of 4,6-DMDBT were estimated using a simplified kinetic model. The catalysts were characterized by N-2 physisorption, X-ray diffraction, Raman, and IR of adsorbed CO at similar to 100 K. The results show that for catalysts supported on pure SBA-15 the noncalcined catalyst prepared with H3PMo12O40 (NiMoP(H-nc)/SBA-15) presents the highest number of active sites, the higher apparent reaction rate constant for the hydrogenation route, and therefore the best 4,6-DMDBT HDS activity. In contrast, for Ti-modified catalysts, NiMoP/(x)Ti-SBA-15, the highest HDS activity was found when 15% of TiO2 was incorporated to SBA-15 and the catalyst was calcined at 773 K. This catalyst presented the highest TOF.

Published
2012

6. Modulation of self-assembly and magnetism of Cu(II) grids in solution

Author

Maxime Bernard, Philippe Turek, Vincent Maurel, Serge Gambarelli, Lydia Brelot, Jean-Marie Lehn, Christophe Burg, Nathalie Parizel, Adrian-Mihail Stadler, Sylvie Choua, Juan Ramirez, University of Granada [Granada], Departamento de Ingenieria Quimica, Facultad de Quimica (UNICAT), UNAM, Servicio de Reumatologia y Unidad de investigacion, Hospital de 12 Octubre, Centre de résonance magnétique biologique et médicale (CRMBM), Aix Marseille Université (AMU)-Assistance Publique - Hôpitaux de Marseille (APHM)-Centre National de la Recherche Scientifique (CNRS), Institut Nanosciences et Cryogénie (INAC), Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Science et d'ingénierie supramoléculaires (ISIS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Universidad de Granada = University of Granada (UGR), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université Louis Pasteur - Strasbourg I-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Collège de France (CdF (institution)), and Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)

Subjects
Models, Molecular, Pyrimidine, Magnetism, Inorganic chemistry, Molecular Conformation, 010402 general chemistry, Ligands, 01 natural sciences, Catalysis, Dissociation (chemistry), law.invention, chemistry.chemical_compound, Ultraviolet visible spectroscopy, law, Materials Chemistry, [CHIM]Chemical Sciences, Electron paramagnetic resonance, ComputingMilieux_MISCELLANEOUS, 010405 organic chemistry, Triazines, Magnetic Phenomena, Metals and Alloys, General Chemistry, Grid, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Dilution, Solutions, Crystallography, Pyrimidines, chemistry, Ceramics and Composites, Self-assembly, Copper
Abstract

Depending on the Cu(II)/ligand molar ratio, a pyrimidine-based ligand generates a tetranuclear grid (1/1) or a dinuclear stick (2/1). EPR, MS and visible spectroscopy studies suggest that dilution produces partial dissociation of the grid in solution. Replacement of 2-H-pyrimidine by a 2-phenyl-triazine unit prevents the dissociation of the grid. All these factors influence the magnetic properties of the architectures herein involved.

Published
2011

7. An UV-Visible study of the stability of the ruthenium hexaammine cation in BEA zeolites—comparison with NaY

Author

Pascale Massiani, Catherine Louis, Perla Castillo-Villalón, Marie-Jeanne Peltre, Jorge Ramírez, Laboratoire de Réactivité de Surface (LRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Departamento de Ingenieria Quimica, Facultad de Quimica (UNICAT), and UNAM

Subjects
Chromatography, Aqueous solution, Chemistry, Cationic polymerization, General Physics and Astronomy, chemistry.chemical_element, [CHIM.CATA]Chemical Sciences/Catalysis, 010402 general chemistry, Molecular sieve, 01 natural sciences, 010406 physical chemistry, 0104 chemical sciences, Ruthenium, Transition metal, Physical chemistry, Diffuse reflection, Physical and Theoretical Chemistry, Spectroscopy, Zeolite
Abstract

A series of Ru/zeolites with Ru content in the range of 1–7 wt.% was prepared by cationic exchange in an aqueous Ru(NH3)6Cl3 solution, at room temperature, of two H–BEA (different particle sizes but same Si/Al ratio of 13), a Cs–BEA (Si/Al 1⁄4 13) and a NaY (Si/Al 1⁄4 2.4), zeolitic supports. The quantitative UV-Visible analysis of the solutions during exchange showed that about 90% of the exchange process was over within the first hour of contact between the zeolite and the solution. This analysis also provided an accurate measurement of Ru content in the solids in real time and gave access to the Ru exchange capacities of the zeolitic supports. Diffuse reflectance UV-Visible spectroscopy showed that the [Ru(NH3)6]3+ cations were exchanged as such in all the BEA zeolites and were not modified after storage of the solids for several months in ambient conditions. On the contrary, the Ru hexaammine cations in NaY were gradually transformed into the Ru-red-wine [(NH3)5RuIIIO–RuIV(NH3)4–O–RuIII(NH3)5]+ and Ru-brown [(NH3)5RuIV–O–RuIII(NH3)4–O– RuIV(NH3)5]7+ cationic trimers, in agreement with literature data. The transformation rate increased with the Ru loading. The reasons for the higher stability of the [Ru(NH3)6]3+ cations in the BEA series than in NaY are discussed.

Published
2004

8. Magnetism in pre-MS intermediate-mass stars and the fossil field hypothesis

Author

Alecian, E., Wade, G. A., Catala, C., Folsom, C., Grunhut, J., Donati, J. -F, Petit, P., Bagnulo, S., Stephen Marsden, Ramirez, J., Landstreet, J. D., Boehm, T., Bouret, J. -C, Silvester, J., Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), National Institute for Biological Standards and Control (NIBSC), Medicines and Healthcare Products Regulatory Agency (MHRA), Universidad de Granada = University of Granada (UGR), Departamento de Ingenieria Quimica, Facultad de Quimica (UNICAT), UNAM, Servicio de Reumatologia y Unidad de investigacion, Hospital de 12 Octubre, University of Western Ontario (UWO), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), University of Granada [Granada], and Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES)

Subjects
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astrophysics (astro-ph), stars: magnetic fields, FOS: Physical sciences, Astrophysics::Solar and Stellar Astrophysics, stars: Herbig, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Earth and Planetary Astrophysics, stars: pre-main sequence, techniques: spectropolarimetry, Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

Today, one of the greatest challenges concerning the Ap/Bp stars is to understand the origin of their slow rotation and their magnetic fields. The favoured hypothesis for the latter is the fossil field, which implies that the magnetic fields subsist throughout the different evolutionary phases, and in particular during the pre-main sequence phase. The existence of magnetic fields at the pre-main sequence phase is also required to explain the slow rotation of Ap/Bp stars. However, until recently, essentially no information was available about the magnetic properties of intermediate-mass pre-main sequence stars, the so-called Herbig Ae/Be stars. The new high-resolution spectropolarimeter ESPaDOnS, installed in 2005 at the Canada-France-Hawaii telescope, provided the capability necessary to perform surveys of the Herbig Ae/Be stars in order to investigate their magnetism and rotation. These investigations have resulted in the detection and/or confirmation of magnetic fields in 8 Herbig Ae/Be stars, ranging in mass from 2 to nearly 15 solar masses. In this contribution I will present the results of our survey, as well as their implications for the origin and evolution of the magnetic fields and rotation., Comment: Proceedings of the CP#AP Workshop held in Vienna in September 2007

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