Mohammed M Bettahar

Title : The Hydrogen Spillover Effect. Fundamental Aspects

Abstract:

In this paper we examine the controversy over the hydrogen spillover effect (HSPE) on metal catalysts supported on non-reducible oxides. We propose that hydrogen spiltover species would consist in H/OH pairs, produced by an interfacial dehydroxylation then diffusing over the support by a thermodynamically neutral H/OH exchange mechanism and not by a H atom hopping process, as generally believed. The hydrogen atoms of the H/OH pairs may be consumed in a hydroconversion reaction or desorb as H₂, giving rise to  /O^2- pairs (where   denotes an oxygen vacancy) which, in turn, may further incorporate H atoms for subsequent hydrogenations or hydrogen storage. H/OH and  /O² constitute conjugated pairs in the hydrogen spillover effect

Biography:

Mohammed M. Bettahar held his PhD degree in Physical Chemistry (Paris, 1975). He worked for the CNRS as Attaché de Recherche (Thiais) and Research Director (Caen). He pursued his career as Full Professor in Algiers (1980) then in Nancy (1995). 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 Chemicals fabrication.