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30 results on '"Boissière, Cédric"'

2. Self-Regulating VO2 Photonic Pigments

Author

De Marco, Maria Letizia, primary, Smith, Olivier, additional, Thorimbert, Fanny, additional, Boissière, Cédric, additional, Nicole, Lionel, additional, Krafft, Jean-Marc, additional, Sanchez, Clement, additional, and Faustini, Marco, additional

Published
2023
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10. Tunable Multifunctional Mesoporous Silica Microdots Arrays by Combination of Inkjet Printing, EISA, and Click Chemistry

Author

De Los Cobos, Olivia, primary, Fousseret, Bruno, additional, Lejeune, Martine, additional, Rossignol, Fabrice, additional, Dutreilh-Colas, Maggy, additional, Carrion, Claire, additional, Boissière, Cédric, additional, Ribot, François, additional, Sanchez, Clément, additional, Cattoën, Xavier, additional, Wong Chi Man, Michel, additional, and Durand, Jean-Olivier, additional

Published
2012
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11. Solvent-free Preparation of Ru/Al2O3Catalysts for CO2Methanation: An Example of Frugal Innovation

Author

Haddad, Ryma, Zhao, Yingrui, Miche, Antoine, Romdhane, Ferdaous Ben, Sudheer, Nivedita, Ersen, Ovidiu, Devred, François, Ribot, François, Sassoye, Capucine, Sanchez, Clement, Debecker, Damien P., Chaneac, Corinne, and Boissière, Cédric

Abstract

To reduce the environmental impact of supported catalyst production in compliance with the recommendations of the UN’s 12th objective, which encourages more sustainable consumption and production patterns, we propose to revisit sol–gel chemistry in a more frugal mode. The principle of frugal innovation is to simplify products and processes, eliminate complexities to make solutions easier to understand and use, and reduce production costs. By this way, the synthesis of ruthenium-based catalysts supported on γ-AlOOH and γ-Al2O3is revised via solvent-free sol–gel chemistry. Such catalysts are successfully prepared in one-pot preparation of the active phase and the support using Ru(acac)3/Al alkoxide that requires no sacrificial organic pore-generating agent, no washing, and no filtration and produces no liquid waste. The mixed Ru/Al precursor is hydrolyzed with a stoichiometric amount of water without any solvent. The obtained materials containing 1 and 3% Ru/Al molar ratios have high specific surface areas, from 300 to 690 m2·g–1and exhibit well dispersed NPs of 1–4 nm on γ-AlOOH with interesting CO2methanation activity and 100% CH4selectivity. This proves that a frugal synthesis approach can do as well as traditional synthesis methods while having a much lower environmental impact (cE-factor, water consumption, and energy consumption are 24, 69, and 24 to 42 times lower, respectively) than the standard multistep protocol..

Published
2023
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30. Nanocrystalline Mesoporous -Alumina Powders “UPMC1 Material” Gathers Thermal and Chemical Stability with High Surface Area

Author

Boissière, Cédric, Nicole, Lionel, Gervais, Christelle, Babonneau, Florence, Antonietti, Markus, Amenitsch, Heinz, Sanchez, Clément, and Grosso, David

Abstract

The designed elaboration of alumina sub-micrometric spherical powder that combines 3D ordered mesoporosity of high accessibility, nanocrystalline structure, and thermal stability up to 900 °C is reported. The strategy used to elaborate such new materials labeled “UPMC1” involves specific block-copolymer templating, aluminum sol−gel chemistry, tuned aerosol generation (spray drying), and sequential thermal treatments that allow designing of a whole set of mesoporous catalytic supports by adjusting ceramization conditions between 700 and 900 °C. When calcination temperature reaches 700 °C, the network remains amorphous and displays structural features of highly porous materials (i.e., porosity, 0.56 cm3·g-1; surface area, 403 m2·g-1; well-calibrated pore diameter, 13 nm). After 30 min at 900 °C, crystallization into -Al2O3particles of around 6 nm has occurred, which has modified the network characteristics (i.e., porosity, 0.34 cm3·g-1; surface area, 134 m2·g-1; well-calibrated pore diameter, 12.5 nm) without destroying the mesostructure. Both amorphous and crystalline final materials present the remarkable properties of mesoporous materials with the unique amphoteric properties of the -alumina surface (40% of tetragonal acid sites) that have great potential application in catalysis, in environment, and as an adsorbent. The present work points out that ordered mesoporosity has the ability to stabilize materials with amorphous or metastable crystalline structure at higher temperatures than what is observed for nonordered mesoporous analogous systems. Such a phenomenon is discussed on the basis of extensive materials characterization mainly based on TEM, XRD, and 29Al high-resolution solid-state NMR.

Published
2006
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