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制备过程对Pd-SiW₁₂/SiO₂催化剂在乙烯选择氧化制乙酸反应中催化性能的影响（英文）

The Effect of Preparation Procedure on the Performance of Pd-SiW₁₂/SiO₂ Catalysts for the Direct Oxidation of Ethylene to Acetic Acid

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【Author】 XU Shuliang1,2,CHU Wenling2,YANG Weishen2,1National Engineering Laboratory for Methanol to Olefins,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China 2State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China

【机构】中国科学院大连化学物理研究所甲醇制烯烃国家工程实验室；中国科学院大连化学物理研究所催化基础国家重点实验室；

【摘要】采用不同负载顺序或制备过程制备了Pd-SiW12/SiO2催化剂,考察了它们在乙烯直接氧化制乙酸反应中的催化性能.结果表明,Pd和SiW12的负载顺序与Pd负载后的处理条件对Pd-SiW12/SiO2催化剂上Pd的分散度影响较大,但对催化剂表面B酸量影响不大,而Pd分散度较高时,相应催化剂活性较高.将Pd和SiW12同时负载于SiO2上时,催化剂表现出较高的催化乙烯直接氧化制乙酸反应活性.更多还原

【Abstract】 Pd-SiW12/SiO2 catalysts were investigated to elucidate the effect of preparation procedure on the direct oxidation of ethylene to acetic acid.Pd-SiW12/SiO2 catalysts with a fixed amount of Pd and SiW12 were prepared in various ways.The order in which Pd and SiW12 were loaded on the SiO2 support and the treatment conditions for the supported Pd have a significant influence on the dispersion of Pd on the Pd-SiW12/SiO2 catalysts,but no influence on the concentration of B acid sites.The Pd-SiW12/SiO2 catalyst prepared by simultaneously loading Pd and SiW12 on the SiO2 support showed the best catalytic activity.The dispersion of Pd was the main factor in the catalytic activity.更多还原