Interaction of olefins with cobalt oxide using the competitive reaction method

The interaction of olefins with cobalt oxide catalyst during their catalytic oxidation was investigated by means of the competitive reaction method. The relative adsorption constants and the rate constants for C4 and C5 olefins were determined. The trend in the adsorption constants for the isomeric olefins was similar to that observed on nickel oxide and on 1,3,5-trinitrobenzene. Increase in the ionization potentials of the olefins resulted in a linear decrease in the logarithms of the adsorption constants. A non-dissociative π-complex having a partial positive charge was estimated for the adsorbed olefin. The role of the adsorbed intermediate in the oxidation reaction is discussed on the basis of the adsorbed state and the rate constants of the isomeric olefins.