OXIDATIVE COUPLING OF METHANE OVER OXIDE CATALYSTS WITH LAYERED STRUCTURE

The catalytic properties of complex oxides with a layered structure Bi2GeO5, Bi2SiO5, Bi4Ti3O12, Bi2CaSrCu3O8+x and YBa2Cu3O6+delta in oxidative coupling of methane (OCM) have been studied. Bi2EO5 metastable compounds have been found to possess the high activity and C2-selectivity 53-70%. It has been assumed that the intergrowth boundaries for the Bi2EO5 decomposition products, on which active catalytic sites may be located, play a specific role on the catalytic performance of the oxides. Bi4Ti3O12 and Bi2CaSrCu3O8+x have close catalytic activity values but Bi2CaSrCu3O8+x as well as YBa2Cu3O6+delta are not selective in OCM reaction.