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研究了不同载体负载的Pt-Ni双金属和单金属催化剂上乙醇重整和1,3-丁二烯加氢反应性能, 以考察氧化物载体对双金属结构和催化活性的影响. 所用的氧化物载体包括γ-Al2O3, SiO2, TiO2, CeO2以及高比表面积(HSA)和低比表面积(LSA)ZrO2. 采用共浸渍法制备催化剂, 用CO化学吸附、透射电镜和扩展X射线吸收精细结构光谱进行催化剂表征, 采用傅里叶变换红外间歇反应器进行化学反应评价. 对于乙醇重整反应, Pt-Ni双金属催化剂优于单金属催化剂, Pt-Ni双金属催化剂活性顺序为TiO2>SiO2>-Al2O3≈LSA-ZrO2>CeO2>HSA-ZrO2. 对于1,3-丁二烯加氢反应, 在SiO2,TiO2和HSA-ZrO2载体上双金属催化剂优于单金属催化剂, Pt-Ni双金属催化剂活性顺序为SiO2>CeO2>-Al2O3>LSA-ZrO2>HSA-ZrO2≈TiO2.
The performance of ethanol reforming and 1,3-butadiene hydrogenation over Pt-Ni bimetallic and monometallic catalysts supported on different supports was investigated in order to investigate the effect of oxide support on the bimetallic structure and catalytic activity. The carrier consists of γ-Al2O3, SiO2, TiO2, CeO2, high specific surface area (HSA) and low specific surface area (LSA) ZrO2.The catalysts were prepared by co-impregnation method and characterized by CO chemisorption, transmission electron microscopy and extended X-ray absorption fine structure spectroscopy The catalytic performance of the Pt-Ni bimetallic catalyst was evaluated by Fourier Transform Infrared Batch Reactor. The Pt-Ni bimetallic catalyst was superior to the monometallic catalyst for the ethanol reforming reaction. The active sequence of Pt-Ni bimetallic catalyst was TiO2> SiO2> Al2O3≈LSA-ZrO2> CeO2> HSA-ZrO2. For the hydrogenation of 1,3-butadiene, the bimetallic catalysts on SiO2, TiO2and HSA-ZrO2were better than the monometallic catalysts, and the activity of Pt-Ni bimetallic catalysts The order is SiO2> CeO2> -Al2O3> LSA-ZrO2> HSA-ZrO2≈TiO2.