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8 results on '"Elisa S. Gomes"'

1. Complementarity of Density Functional Theory and Nuclear Magnetic Resonance Tools To Probe the Nano-Layered Silicates Surface Chemistry and Morphology

Author

Pierre Micoud, Maguy Jaber, Virginie Herledan, François Martin, Hervé Toulhoat, Elisa S. Gomes, Guillaume Laugel, Hélène Lauron-Pernot, Yannick Millot, Mathilde Poirier, Géosciences Environnement Toulouse (GET), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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), Laboratoire de Réactivité de Surface (LRS), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Archéologie Moléculaire et Structurale (LAMS), ERT Géomatériaux, 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)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), 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)-Observatoire Midi-Pyrénées (OMP), 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), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and 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)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3)

Subjects
02 engineering and technology, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Complementarity (physics), 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, General Energy, Chemical physics, Nano, Density functional theory, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Physical and Theoretical Chemistry, 0210 nano-technology
Abstract

International audience; By combining experimental, spectroscopic, structural, and physical characterizations and extensive density functional theory simulations, unprecedented insight is gained on the local surface properties of synthetic talc nanoparticles, their structure, morphology and particle size distribution. Basically, the nuclear magnetic resonance (NMR) chemical shifts profiles of these nano-layered silicates were dissected thoroughly and revealed the existence of bulk and surface contributions in the 1H and 29Si spectra. Beyond the fact that significant knowledge has been acquired on the overall structure of the synthetic talc nanoparticles (mixture of defective and non-defective layers, with defects rejected on the external interfaces), the highlighting of these signals enabled us to access the average morphologies and particle sizes of the samples by decomposing the 29Si NMR profiles into Lorentzian contributions. Finally, the particle size distributions in number were also described in terms of a log-normal law. These distributions were compared to the particle sizes obtained from X-ray diffraction (XRD), Brunauer–Emmett–Teller measurements (BET), and dynamic light scattering (DLS) methods. The distributions of gyration radii determined by DLS are shown to match the distributions in size consistent with the same morphology.

Published
2020
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2. ZSM-5 synthesis by the assistance of biomass and biomass-derivate compounds

Author

Benoit Louis, Elisa S. Gomes, Donato A.G. Aranda, and Marcelo Maciel Pereira

Subjects
Chemistry, Biomass, Sorption, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Hydrothermal circulation, 0104 chemical sciences, Catalysis, Hydrolysis, chemistry.chemical_compound, Mechanics of Materials, General Materials Science, Methanol, ZSM-5, 0210 nano-technology, Bagasse, Nuclear chemistry
Abstract

ZSM-5 zeolites with tailored properties were successfully synthesized in the presence of biomass-derivative compounds following conventional hydrothermal route. The strategy consisted of introducing, along with silica and alumina precursors, either sugar cane bagasse itself or biomass-derivate compounds obtained by hydrolysis of the sugar cane. As-prepared ZSM-5 catalysts were thoroughly characterized by XRD, XRF, SEM, nitrogen sorption and H/D isotope exchange techniques. The catalysts were evaluated both in the cracking of n-hexane and the methanol conversion into hydrocarbons. Our approach yielded solely ZSM-5 phase with broad differences in their intrinsic properties: external surface area (between 51 and 153 m2 g−1); 8

Published
2018
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3. Biomass-mediated ZSM-5 zeolite synthesis: when self-assembly allows to cross the Si/Al lower limit

Author

Pit Losch, Guillaume Laugel, Ana B. Pinar, Marcelo Maciel Pereira, Benoît Louis, Elisa S. Gomes, Alessandra V. Silva, Sangaraju Shanmugam, Marc Georg Willinger, Céline Chizallet, Universidade Federal do Rio de Janeiro (UFRJ), Paul Scherrer Institute (PSI), Fritz-Haber-Institut der Max-Planck-Gesellschaft (FHI), Max Planck Society, Daegu Gyeongbuk Institute of Science and Technology, IFP Energies nouvelles (IFPEN), Laboratoire de Réactivité de Surface (LRS), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Matériaux, Surfaces et Procédés pour la Catalyse (LMSPC), Institut de chimie et procédés pour l'énergie, l'environnement et la santé (ICPEES), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Supramolecular chemistry, Biomass, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Lower limit, 0104 chemical sciences, Catalysis, chemistry.chemical_compound, Cracking, chemistry, [CHIM]Chemical Sciences, Physical chemistry, Methanol, Self-assembly, 0210 nano-technology, Brønsted–Lowry acid–base theory
Abstract

International audience; A family of Al-rich ZSM-5 zeolites with Si / Al = 8 ± 0.5 was prepared according to a biomass-mediated supramolecular approach. A combination of advanced characterisation techniques and periodic density functional theory (DFT) calculations unraveled the purity and stability of unexpected Al-enriched ZSM-5 structures, hence allowing to cross the frontier of Si / Al lower limit. In addition, these Al-rich ZSM-5 zeolites demonstrated high catalytic activity in n-hexane cracking and methanol conversion into hydrocarbons, being in line with the presence of numerous BrØnsted acid sites.

Published
2018
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4. Strategy to design zeolite catalysts in the presence of biomass

Author

Alessandra V. Silva, Claire Bernardon, Benoit Louis, Pit Losch, Marcelo Maciel Pereira, Gaëtan Lutzweiler, Ksenia Parkhomenko, and Elisa S. Gomes

Subjects
010405 organic chemistry, Inorganic chemistry, Biomass, Ionic bonding, General Chemistry, 010402 general chemistry, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Catalysis, chemistry.chemical_compound, chemistry, Mechanics of Materials, General Materials Science, Methanol, Zeolite, Selectivity, Bagasse, Alkaline hydrolysis
Abstract

LTA, GIS, *BEA and MFI zeolites have been successfully prepared using sugar cane bagasse as a hard templating agent as well as after alkaline hydrolysis of those biomass residues. Depending on the zeolite topology chosen, different effects could be highlighted: susceptibility to crystal intergrowths (LTA), formation of macroporous micron-sized assemblies (GIS), or significant impact on MFI crystal morphologies. The LTA zeolite series was used in ammonia ionic exchange experiments. A definite enhancement in the total NH4+-adsorption capacity could be evidenced for a biomass hydrolysate structured sample. In the case of MFI zeolites, different catalytic activities and stabilities were achieved in the methanol conversion into hydrocarbons. Likewise, drastic changes were observed in the selectivities, ranging from an expected methanol-to-olefins (MTO) behaviour for highly siliceous zeolites, to a close to 90% selectivity toward C5+ gasoline fraction (MTG) for counterparts with low Si/Al-ratios.

Published
2017
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5. Biomass-assisted Zeolite Syntheses as a Tool for Designing New Acid Catalysts

Author

Gaëtan Lutzweiler, Alessandra V. Silva, Pit Losch, Benoit Louis, Tiago L. Coelho, Elisa S. Gomes, Arnaldo C. Faro, Cristiane S. Cardoso, Joana Pinto, and Marcelo Maciel Pereira

Subjects
Materials science, Organic Chemistry, Biomass, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Catalysis, 0104 chemical sciences, Inorganic Chemistry, Acid catalysis, Organic chemistry, Physical and Theoretical Chemistry, 0210 nano-technology, Zeolite
Published
2017
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6. Influence of Biomass Residues on the Metastability of Zeolite Structures

Author

Thierry Romero, Audrey Balanqueux, Manel Ben Osman, Benoit Louis, Alessandra V. Silva, Claire Bernardon, Elisa S. Gomes, Tiago L. Coelho, Gaëtan Lutzweiler, Arnaldo C. Faro, Pit Losch, and Marcelo Maciel Pereira

Subjects
Materials science, Chemical engineering, 010405 organic chemistry, Metastability, Inorganic chemistry, Biomass, General Materials Science, 010402 general chemistry, Zeolite, 01 natural sciences, 0104 chemical sciences
Published
2016
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7. Gasoline from Biomass through Refinery-Friendly Carbohydrate-Based Bio-Oil Produced by Ketalization

Author

Bruna M. C. da Costa, Elina Bastos Caramão, Nakédia M.F. Carvalho, Rodrigo O. M. A. de Souza, Elisa S. Gomes, Yiu L. Lam, Thiago Crispim da Silva, Matheus O. de Souza, Marcelo Maciel Pereira, Thalita G. Barros, Nuno Batalha, Leandro S. M. Miranda, Luciana Rego Monteiro Dos Santos, Alessandra V. Silva, Marlon B.B. de Almeida, and Maria Luisa Aleixo Gonçalves

Subjects
Chemistry, General Chemical Engineering, Biomass, Coke, Fuel oil, Alkenes, Refinery, General Energy, Biofuels, Yield (chemistry), Zeolites, Environmental Chemistry, Octane rating, Organic chemistry, General Materials Science, Gasoline, Cellulose, Pyrolysis
Abstract

The introduction of biomass-derived compounds as an alternative feed into the refinery structure that already exists can potentially converge energy uses with ecological sustainability. Herein, we present an approach to produce a bio-oil based on carbohydrate-derived isopropylidene ketals obtained by reaction with acetone under acidic conditions directly from second-generation biomass. The obtained bio-oil showed a greater chemical inertness and miscibility with gasoil than typical bio-oil from fast pyrolysis. Catalytic upgrading of the bio-oil over zeolites (USY and Beta) yielded gasoline with a high octane number. Moreover, the co-processing of gasoil and bio-oil improved the gasoline yield and quality compared to pure gasoil and also reduced the amount of oxygenated compounds and coke compared with pure bio-oil, which demonstrates a synergistic effect.

Published
2014
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8. Back Cover: Biomass-assisted Zeolite Syntheses as a Tool for Designing New Acid Catalysts (ChemCatChem 12/2017)

Author

Pit Losch, Marcelo Maciel Pereira, Elisa S. Gomes, Arnaldo C. Faro, Alessandra V. Silva, Cristiane S. Cardoso, Benoit Louis, Tiago L. Coelho, Joana Pinto, and Gaëtan Lutzweiler

Subjects
Inorganic Chemistry, Acid catalysis, Chemical engineering, Chemistry, Organic Chemistry, Organic chemistry, Biomass, Cover (algebra), Physical and Theoretical Chemistry, Zeolite, Catalysis
Published
2017
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