Pd-SiW_(12)/SiO_2催化乙烯气相直接氧化制乙酸:SiO_2孔结构的影响  

Effect of Pore Structure of SiO_2 on Catalytic Performance of Pd-SiW_(12)/SiO_2 for Direct Oxidation of Ethylene to Acetic Acid

作　　者：徐庶亮[1,2] 王丽霞[1,2] 楚文玲[1] 杨维慎[1] 

机构地区：[1]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,辽宁大连116023 [2]中国科学院研究生院,北京100049

出　　处：《催化学报》2009年第10期976-980,共5页

基　　金：国家杰出青年基金(20725313);国家重点基础研究发展计划(973计划;2005CB221404)

摘　　要：采用三种不同孔结构的SiO2制备了Pd-SiW12/SiO2催化剂,通过X射线衍射、N2物理吸附、吡啶吸附红外光谱以及H2脉冲化学吸附对催化剂进行了表征,并考察了Pd-SiW12/SiO2催化剂上乙烯直接氧化制乙酸反应性能.结果表明,以孔径较大的粗孔硅胶为载体制备的Pd-SiW12/SiO2催化剂显示出最高的催化活性,乙酸收率为145.2g/(L·h).这是由于Pd在粗孔硅胶载体表面良好的分散使其具有较高的催化活性.The Pd-SiW12/SiO2 catalysts with different pore structure of SiO2 were prepared for direct oxidation of ethylene to acetic acid. The catalysts were characterized by X-ray diffraction, N2 physical adsorption, infrared spectroscopy of adsorbed pyridine, and H2-pulse chemical adsorption. The results showed that the pore structure of SiO2 had an important influence on the catalytic performance of the catalysts. The Pd-SiW12/SiO2 catalyst prepared by the SiO2 support with larger pore size and pore distribution exhibited the highest catalytic activity, on which 145.2 g/（L.h） of acetic acid yield was obtained. Pd dispersion was responsible for the catalytic activity of the Pd-SiW12/SiO2 catalyst.

关 键 词：钯 硅钨酸 硅胶 乙烯 氧化 乙酸 

分 类 号：O643.32[理学—物理化学] TQ225.122[理学—化学]