Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (05): 1157-1162.doi: 10.3866/PKU.WHXB20110509

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Effects of Alkaline Earth Metal on Performance of ZrO2-Al2O3 Support and Pd-Rh Close-Coupled Catalyst

HE Sheng-Nan, CUI Ya-Juan, YAO Yan-Ling, FANG Rui-Mei, SHI Zhong-Hua, GONG Mao-Chu, CHEN Yao-Qiang   

  1. Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
  • Received:2011-01-10 Revised:2011-03-10 Published:2011-04-28
  • Contact: SHI Zhong-Hua, CHEN Yao-Qiang E-mail:nic7501@ scu.edu.cn; shizh96@scu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20773090, 20803049) and Specialized Research Fund for the Doctoral Program of Higher Education, China (20070610026).

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Abstract:

A series of alumina supports stabilized by alkaline earth metals and zirconia were prepared by the peptizing method. Pd-Rh close-coupled catalysts supported on modified alumina were prepared by the impregnation method. The supports were characterized by low temperature nitrogen adsorption-desorption method, X-ray diffraction (XRD), and NH3-temperature programmed desorption (NH3-TPD). For the catalysts, H2-temperature programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS) were carried out. We also carried out catalytic activity tests for C3H8 conversion. Results show that the addition of alkaline earth metals increases the surface area of the supports and the surface area of Sr-Zr-Al reaches 164 m2·g-1 after calcination at 1000 °C for 5 h. The introduction of alkaline earth metals into the ZrO2-Al2O3 supports also improves their catalytic activity toward propane oxidation and the activities of the Pd-Rh catalysts containing alkaline earth metals are higher than that of the catalyst prepared with a ZrO2-Al2O3 support.

Key words: Alkaline earth metal, ZrO2-Al2O3, Pd-Rh, Close-coupled catalyst, Propane