2010•Journal of Molecular Catalysis(China)Requires access
The Preparation,Characterization and its Catalytic Performance of Ru-La_2O_3/γ-Al_2O_3 Catalysts for CO Selective Oxidation
Lin Wei-ming
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Abstract
The Ru-La2O3/γ-Al2O3 catalysts with various La2O3 contents were synthesized by impregnation method,the catalysts were tested for the CO selective oxidation and characterized by XRD,XPS,H2-TPR,CO-TPR.BET techniques.The effects of various parameters(La2O3 loading and pretreatment methods) on Ru-La2O3/Al2O3 catalysts structure and performance were investigated.The results showed that higher CO conversion(99%) and O2 useful ratio(55.7%)were obtained at 110～170 ℃ on the Ru1La6/Al2O3.La2O3 promoted the dispersion of Ru species,thus enhance the catalytic activity.When Ru1La6/Al2O3 catalyst was heated in a H2/N2 mixed gas flow as the pretreatment,the CO oxidation activity was highly improved at a low temperature range,the 3d electron binding energies of Ru species of the catalyst decreased,the amounts of surface Ru species and surface lattice oxygen concentration increased,which could be of benefit for the oxidation reaction of CO.