Oxidative Coupling Of Methane On Fe-doped La_2o_3 Catalyst

摘要

Various La_2O_3-based catalysts are well-known to be useful for the oxidative coupling of methane (OCM reaction). We examined the catalytic activities of various La_2O_3-based OCM catalysts for the OCM reaction in the kinetic region (i.e., lower O_2 conversion). Our investigation revealed that the Fe-doped La_2O_3 catalyst is a good candidate for the OCM reaction. The La/Fe ratio of the Fe-doped La_2O_3 catalyst is an important factor for OCM activity. Especially, the O_2-based C_2 yield of the Fe-doped La_2O_3 catalyst was higher than that of La_2O_3 in the case of La/Fe > 5. The Fe-doped La_2O_3 catalyst modified with Na_2O and Na_4P_2O_7 showed high C_2 selectivity (83%). Moreover, modification with Bi compounds also enhanced C_2 selectivity of the Fe-doped La_2O_3 catalyst. This catalyst showed higher C_2 yield than the Fe-doped La_2O_3 catalyst.