Lattice oxygen of La_(1-x)Sr_xMO3(M=Mn,Ni)and LaMnO_(3-alpha)F_(beta)perovskite oxides for the partial oxidation of methane to synthesis gas

摘要

The partial oxidation of methane to synthesis gas by using the lattice oxygen of La_(1-x)Sr_xMO3(M=Mn,Ni;x=0-0.4)and LaMnO_(3-alpha)F_(beta)(beta/(3-alpha)=0.1)perovskite oxides was explored.Approximately 75% CO selectivity at 16% CH4 conversion with H2/CO molar ratio of ca.2.5 can be achieved at 800 °C.The stability of the perovskite structure and the reactivity/selectivity of lattice oxygen are found to be dependent on(i)B-site element,(ii)degree of substitution of La with Sr,and(iii)fluorination of the perovskite oxide.