Abstract
Abstract Lanthanum stannate pyrochlores, La2Sn2O7 and La2SnMO7(M = Mn, Fe, Co, Ni, Cu), were successfully prepared by citric acid method and confirmed by XRD. TG and TPR characterizations showed that the introduction of transitional metals resulted in significant impacts on the structures and redox performances of prochlores. All the selected transitional metals could significantly improve their methane catalytic combustion performance. Among the doped pyrochlores, La2SnCoO7 pyrochlore possessed optimum activities at low temperatures, and Fe-doped pyrochlore showed highest reactivity for high temperature combustion and was proved to be promising materials for high temperature catalytic combustion. The reactivity differences of La2SnMO7 were reasonably attributed to the strong interactions between Sn and transitional metal.
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