制备方法对Ru/CeO2催化氨分解性能的影响OA北大核心CSTPCD

A series of Ru/CeO2 catalysts were obtained using co-precipitation,deposition-precipitation,and impregnation methods,and the structure of the catalysts was characterized by XRD,N2 adsorption-desorption,SEM,CO2-TPD,H2-TPD,H2-TPR,XPS,and N2-TPD.The ammonia decomposition performance of the catalysts was investigated.The experimental results show that the NH3 conversion over Ru/CeO2-CP catalysts prepared by the coprecipitation method could reach 80.7%at 450℃and GHSV=15 000 h-1,which is 1.3 and 2.7 times of those of the Ru/CeO2 catalysts derived from the deposition-precipitation and the impregnation method,respectively.Ru/CeO2-CP prepared by co-precipitation has a loose surface structure with the largest specific surface area,providing more abundant alkaline sites,and the strong interaction between CeO2 and Ru metal facilitates electron transfer from CeO2 to Ru,increasing the electron density on the surface of Ru particles,which promotes the recombinative desorption of N species on the catalysts surface.