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Mohammed M Bettahar, Speaker at Catalysis Conferences
Lorraine University, France
Title : The hydrogen spillover effect influencing parameters


Mechanisms of formation and diffusion, structure and role in hydrogenation reactions of hydrogen spillover are still debated. In this study we show how these issues are correlated to the nature and particle size [nanoparticles (NP), nanoclusters (NC), single atoms (SA)] of the metal phase, the nature of the oxide support, the nature of the reactant organic molecules. It is formed by reduction/dehydration or dehydroxylation processes. The H spilt-over species diffusion over the support proceeds by migration of pairs of H atoms, not by the hopping of H atoms from OH to OH surface groups, as generally believed. No correlation can exist between catalytic activity and concentration of hydrogen spillover or oxygen vacancies. The latter are active at the interface only. Activity orders in support effect studies are empirically useful but not pertinent from the fundamental point of view. Four hydrogenation mechanisms were identified.


Mohammed M. Bettahar held his PhD degree in Physical Chemistry in Paris. He worked for the French CNRS as Attaché de Recherche in Paris and Research Director in Caen. He pursued his career as Full Professor in Algiers then in Nancy. He is Professor Emeritius in Lorraine University since 2015. Main research topics are related to Nanomaterials and Catalysis (Selective Hydrogenation or Oxidation, CO2 or CH4 transformations, Hydrogen Storage). Currently his research focuses on Nanomaterials for biofuels and biochemicals fabrication.