Citation: HE Sheng-Nan, CUI Ya-Juan, YAO Yan-Ling, FANG Rui-Mei, SHI Zhong-Hua, NG Mao-Chu, CHEN Yao-Qiang. Effects of Alkaline Earth Metal on Performance of ZrO₂-Al₂O₃ Support and Pd-Rh Close-Coupled Catalyst[J]. Acta Physico-Chimica Sinica, ;2011, 27(05): 1157-1162. doi: 10.3866/PKU.WHXB20110509 shu

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

1.
Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China

Received Date: 10 January 2011
Available Online: 30 March 2011
Fund Project: 国家自然科学基金(20773090, 20803049) (20773090, 20803049)教育部博士点新教师基金(20070610026)资助项目 (20070610026)

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.
- Alkaline earth metal,
- ZrO₂-Al₂O₃,
- Pd-Rh,
- Close-coupled catalyst,
- Propane
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Effects of Alkaline Earth Metal on Performance of ZrO₂-Al₂O₃ Support and Pd-Rh Close-Coupled Catalyst