Build-up of active oxide surface under influence of the reaction mixture

Abstract

On studying the approach to steady state of oxide catalysts for oxidative coupling of methane and propylene as well as of catalysts for cross-coupling between toluene and ammonia (toluene ammoxidation), three kinds of surface changes under the reaction conditions have been revealed. The formation of a two-dimensional phase, surface reduction and generation of adsorptive type active sites has been shown to be responsible for a build-up of more active and/or selective surface structures.