SOME ASPECTS OF THE MECHANISMS OF CATALYTIC REFORMING REACTIONS

A brief review is given of the evolution of our ideas on the mechanism of catalytic reforming reactions over the last 40 years. The early bi functional reaction mechanism, though criticized much, led first to an understanding and optimization of the reforming process and later to several other catalyst and process innovations. Kinetic and tracer stu dies on model catalysts using single hydrocarbons as reactants and the surface-science approach revealed the finer nuances of the mechanism involved. Simultaneously, the roles of S, Cl, coke, and hydrogen and o f a second metal component like Re, Ir, or Sn in the industrial cataly st were also understood to a greater or lesser extent. All these resul ts make the mechanism of reforming reactions a field of fascinating co mplexity in fundamental and industrial catalysis.