Role of Ceria in Oxidative Dehydrogenation on Supported Vanadia Catalysts

摘要

Abstract: The effect of the suppport on oxidative dehydrogenation activity for vanadia/ceria systems isnexamined for the oxidation of methanol to formaldehyde by use of well-defined VOx/CeO2(111) modelncatalysts. Temperature-programmed desorption at low vanadia loadings revealed reactivity at much lowerntemperature (370 K) as compared to pure ceria and vanadia on inert supports such as silica. Densitynfunctional theory is applied and the energies of hydrogenation and oxygen vacancy formation also predictnan enhanced reactivity of the vanadia/ceria system. At the origin of this support effect is the ability of cerianto stabilize reduced states by accommodating electrons in localized f-states.