1. Design of amphoteric mixed oxides of zinc and Group 3 elements (Al, Ga, In): migration effects on basic features
- Author
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Adrien Mekki-Berrada, Simona Bennici, Aline Auroux, Didier Grondin, ENERGIE (ENERGIE), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), and EAU:ENERGIE+AAU
- Subjects
Isothermal microcalorimetry ,Surface Properties ,Inorganic chemistry ,General Physics and Astronomy ,chemistry.chemical_element ,Gallium ,02 engineering and technology ,Zinc ,010402 general chemistry ,Indium ,01 natural sciences ,Catalysis ,chemistry.chemical_compound ,Adsorption ,Specific surface area ,Aluminum Oxide ,Dehydrogenation ,Particle Size ,Physical and Theoretical Chemistry ,Bifunctional ,[CHIM.CATA]Chemical Sciences/Catalysis ,021001 nanoscience & nanotechnology ,[SDE.ES]Environmental Sciences/Environmental and Society ,0104 chemical sciences ,chemistry ,Zinc Oxide ,0210 nano-technology ,Oxidation-Reduction - Abstract
EAU:ENERGIE+AMB:DGR:SBE:AAU; The design of new amphoteric catalysts is of great interest for several industrial processes, especially those covering dehydration and dehydrogenation phenomena. Adsorption microcalorimetry was used to monitor the design of mixed oxides of zinc with Group 3 elements (aluminium, gallium, indium) with amphoteric character and enhanced specific surface area. Acid-base features were found to evolve non-linearly with the relative amounts of metal, and the strengths of the created acidic or basic sites were measured by adsorption microcalorimetry. A panel of bifunctional catalysts of various acid-base (amounts, strengths) and redox character was obtained. Besides, special interest was given to In-Zn mixed oxides for their enhanced basicity: this series of catalysts displays important basic features of high strength (q(diff) (SO2 ads.) > 200 kJ mol(SO2)(-1)) in substantial amounts (1 - 2 mu mol m(catalyst)(-2)), whose impact on efficiency or selectivity in catalytic dehydration/dehydrogenation can be valuable.
- Published
- 2012