催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (10): 976-980.

• 研究论文 • 上一篇    下一篇

Pd-SiW12/SiO2催化乙烯气相直接氧化制乙酸：SiO2孔结构的影响

徐庶亮 1, 2, 王丽霞 1, 2, 楚文玲 1, 杨维慎 1   

  1. 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
  • 收稿日期:2009-10-25 出版日期:2009-10-25 发布日期:2013-06-06

Effect of Pore Structure of SiO2 on Catalytic Performance of Pd-SiW12/SiO2 for Direct Oxidation of Ethylene to Acetic Acid

XU Shuliang1, 2, WANG Lixia1, 2, CHU Wenling1,*, YANG Weishen1,*   

  1. 1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China 2Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2009-10-25 Online:2009-10-25 Published:2013-06-06

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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 145.2 g/(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.

关键词: 钯, 硅钨酸, 硅胶, 乙烯, 氧化, 乙酸

Abstract: 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.

Key words: palladium, silicotungstic acid, silica, ethylene, oxidation, acetic acid