Abstract: The kinetic study of the oxidative dehydrodimerization of propylene over the Bi-Ce oxidecatalyst showed that the dimer formation reaction is first order with respect to the partialpressure of propylene and is zero order with respect to that Of oxygen, while the formationof carbon dioxide is zeroth order and 0.35 order with respect to the partial pressure of pro-pylene and to that of oxygen, respectively. It is considered that the dimerization and thecomplete oxidation of propylene take place on different active sites patallelly and the coup-ling of propylene is the rate-determining step, which is a result of the reaction between agaseous propylene molecule and an adsorbed one on the catalyst surface (Eley-Ridsal type).

Key words: Bismuth-cerium oxide, Propylence, Oxidative dehydrodimerization, Kinetics