The Nature of Active Centers and the Kinetics of Catalytic Dehydrogenation

Abstract

This chapter describes the quasi-homogeneous surfaces, flow method kinetics, experimental result on dehydrogenation, and discussion of results and the multiplet theory. The kinetics of dehydrogenation depends upon the nature of the catalyst. The catalysts used, divide sharply into two groups-metals and oxides. Experimental evidence shows that, in dehydrogenation the calculated ΔH° is practically independent of the temperature over the range of 50 or 100°. The geometry and energy aspects of the multiplet theory are useful in interpreting the kinetics of catalytic dehydrogenation and in throwing light on the nature of the active centers. The possibility was shown of the experimental determination of change in free energy, enthalpy, and entropy of adsorption on the active centers and of the bond energies between the reacting atoms of the molecule and the atoms of the active centers of the catalyst.