Controlled preparation of Nano-Au/NaZSM-5 catalyst and its catalytic performance

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作者单位: a Department of Chemistry and Chemical Engineering, Taishan Medical University, Taian 271016, China State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

摘要: Series of highly dispersed size-controlled nano-Au/NaZSM-5 catalysts were prepared by nitromethane reduction-colloid gold immobilization method. Taking heterogeneous CO oxidation as a model reaction, the influences of Au particle size, pH value, reaction temperature, reaction time, activation temperature and Au loading amount on the activities of the catalysts were investigated. These catalysts were characterized by means of transmission electron microscopy , powder X-ray diffraction , X-ray pho...更多; Series of highly dispersed size-controlled nano-Au/NaZSM-5 catalysts were prepared by nitromethane reduction-colloid gold immobilization method. Taking heterogeneous CO oxidation as a model reaction, the influences of Au particle size, pH value, reaction temperature, reaction time, activation temperature and Au loading amount on the activities of the catalysts were investigated. These catalysts were characterized by means of transmission electron microscopy , powder X-ray diffraction , X-ray photoelectron spectroscopy and H 2 temperature programmed reduction to verify the surface chemical states and the structures of the catalysts. The results show that both the preparation procedure and the reaction conditions have great influences on the sizes of gold particles and the activities of Au/NaZSM-5 catalysts. The performances of the catalysts are obviously dependent on the sizes of gold nanoparticles.收起

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