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The performance of La2-x M x CuO4 perovskites (where M=Ce,Ca or Sr) as catalysts for the water-gas shift reaction was investigated at 290℃ and 360℃.The catalysts were characterized by EDS,XRD,N2 adsorption-desorption,XPS and XANES.The XRD results showed that all the perovskites exhibited a single phase (the presence of perovskite structure),suggesting the incorporation of metals in the perovskite structure.The XPS and XANES results showed the presence of Cu2+ on the surface.The perovskites that exhibited the best catalytic performance were La 2 x Ce x CuO 4 perovskites,with CO conversions of 85% 90%.Moreover,these perovskites have higher surface areas and larger amounts of Cu on the surface.And Ce has a higher filled energy level than the other metals,increasing the energy of the valence band of Ce and providing more electrons for the reaction.Besides,the La1.80Ca0.20CuO4 perovskite showed a good catalytic performance.
The performance of La2-xMxCuO4 perovskites (where M = Ce, Ca or Sr) as catalysts for the water-gas shift reaction was investigated at 290 ° C and 360 ° C. The catalysts were characterized by EDS, XRD, N2 adsorption- desorption, XPS and XANES.The XRD results showed that all the perovskites exhibited a single phase (the presence of perovskite structure), suggesting the incorporation of metals in the perovskite structure. XPS and XANES results showed the presence of Cu2 + on the surface. The perovskites that exhibits the best catalytic performance were La 2 × Ce x CuO 4 perovskites, with CO conversions of 85% 90% .Moreover, these perovskites have higher surface areas and larger amounts of Cu on the surface. And Ce has a higher filled energy level than the other metals, increasing the energy of the valence band of Ce and providing more electrons for the reaction .esides, the La1.80Ca0.20CuO4 perovskite showed a good catalytic performance.