Abstract

An elaboration is made of data published by the author's previous contributions on (i) the adsorption of benzene and cyclohexane on Fe, Co, Ni, Cu, Pt and their oxides; (ii) on the mechanism of cyclohexane dehydrogenation and hexane dehydrocyclization on M VIII metals and Cr 2O 3, and (iii) on the interaction of ethane with Ni, Pd, and Cr 2O 3. It follows from this systematic comparison that there are no fundamental differences between catalytic behaviour of metals and oxides in these cases. This is explained by interaction of the initial catalysts with the participants of the reactions producing the real active sites. The term “metal” and “metal oxide” indicates the initial state of the surface which differs substantially from the real catalytic one.

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