Catalytic oxidation of ethyl acetate by CeO2 microspheres loaded with Ru
CeO2 microspheres are prepared by hydrothermal method,and Ru/CeO2 microspheres are prepared by deposition and precipitation methods loading noble metal Ru onto the surface of CeO2 microspheres.The mor-phology of CeO2 is observed by SEM.The distribution of Ru particles onto the surface of CeO2 microspheres is observed by TEM.The phase of the samples are analyzed by XRD.The changes of specific surface area and pore distribution before and after Ru loading are compared by N2 adsorption and desorption.The changes of sur-face chemical structure before and after loading are analyzed by XPS test.The H2-TPR and O2-TPD are used to characterize the reduction and oxygen activation of the catalysts before and after loading.The catalytic oxidation performance of ethyl acetate is also tested.The results show that the structure of Ru/CeO2 is similar to that of CeO2,both are mesoporous materials.Ru can enter CeO2 lattice in ionic state,resulting in CeO2 lattice distor-tion.Ru/CeO2 catalyst shows a strong interaction between noble metal and cerium dioxide.Compared with CeO2,the number of reactive oxygen species is increased,and the oxygen storage and release capacity is en-hanced,which promots the catalytic oxidation performance of ethyl acetate at a low temperature.With the in-crease of Ru loading,the catalytic oxidation performance of ethyl acetate by Ru/CeO2 first improves and then gradually levels off.The sample with 1.0%Ru/CeO2 is the best,and T90 decreases by 28.5℃.
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