Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (18): 2148-2152. Previous Articles     Next Articles

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负载Pd基碳二选择加氢催化剂上乙炔加氢反应的原位红外光谱研究

张齐,戴伟*,穆玮,张火利   

  1. (中国石油化工股份有限公司北京化工研究院 北京 100013)
  • 投稿日期:2010-11-26 修回日期:2011-05-06 发布日期:2011-05-26
  • 通讯作者: 张齐 E-mail:zhangq.bjhy@sinopec.com

Study on Pd Catalysts for Selective Hydrogenation of Acetylene with In Situ DRIFTS

ZHANG Qi, DAI Wei, MU Wei, ZHANG Huo-Li   

  1. (Beijing Research Institute of Chemical Industry, SINOPEC, Beijing 100013)
  • Received:2010-11-26 Revised:2011-05-06 Published:2011-05-26

Using acetylene and ethylene as probe molecule, acetylene hydrogenation on Pd-Ag/Al2O3 and Pd/Al2O3 catalysts were studied by in-situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS). Chemisorptions properties of catalysts were characterized by C2H2 adsorption, C2H2 and H2 alternate adsorption and co-adsorption. The results showed the different adsorption properties between acetylene and ethylene over Pd-Ag/Al2O3 or Pd/Al2O3. In addition, hydrogenation of acetylene would create the carbonaceous layer on the catalysts surface, the carbonaceous layer was made up of long-chain alkane which has similar infrared spectra of green oil and has great effect on the selectivity properties of catalyst. There is a correlation between the amount of carbonaceous layer and the adsorption order of acetylene and hydrogen.

Key words: DRIFTS, ethyne, hydrogen, metal catalyst, Pd-Ag/Al2O3