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Citation: CAI Li, WANG Kang-Cai, ZHAO Ming, NG Mao-Chu, CHEN Yao-Qiang. Application of Ultrasonic Vibrations in the Preparation of Ce-Zr-La/Al₂O₃ and Supported Pd Three-Way-Catalyst[J]. Acta Physico-Chimica Sinica, ;2009, 25(05): 859-863. doi: 10.3866/PKU.WHXB20090506 shu

Application of Ultrasonic Vibrations in the Preparation of Ce-Zr-La/Al₂O₃ and Supported Pd Three-Way-Catalyst

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

Corresponding author: WANG Kang-Cai, ZHAO Ming, NG Mao-Chu, nic7501@communicationauthoremail.scu.edu.cn CHEN Yao-Qiang,
Received Date: 4 September 2008
Available Online: 4 March 2009

CeO2-ZrO2-La2O3/Al2O3 (CZLA) was prepared by pretreatment with ultrasonic vibrations and Pd three-way-catalysts (TWCs) were then synthesized. Supports were characterized using Brunauer-Emmett-Teller(BET) and X-ray diffraction (XRD). Pd catalysts were characterized using NO-temperature programmed desorption (NO-TPD), H2-temperature programmed reduction (H2-TPR) and a catalytic activity test. The specific surface area of the uv-CZLA (CZLA with ultrasonic vibration) and the n-CZLA (CZLA without ultrasonic vibration) was 130 and 117 m2·g-1, respectively, after calcination at 900 ℃. The uv-CZLA material had larger pores of 11.4 nm and this made it more thermally stable than the n-CZLA. uv-CZLA supports were calcined at various temperatures and showed only one Ce0.5Zr0.5O2 phase. However, θ-Al2O3 was observed in n-CZLA after aging at 1150 ℃for 5 h. Almost no difference in NO-TPD was found for fresh and aged Pd/uv-CZLA catalysts. Results from the H2-TPR of the Pd/uv-CZLA catalyst showed a higher reductive peak temperature and a far larger reducing peak area than that of Pd/n-CZLA. Results of three-way reactions show that the catalyst prepared using ultrasonic vibration treatment possesses a lower light-off temperature for the removal of all three main pollutants in vehicle emissions and also a better temperature property.
- Pd three-way-catalyst,
- Catalytic activity,
- NO-TPD,
- H2-TPR,
- Textural property
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Application of Ultrasonic Vibrations in the Preparation of Ce-Zr-La/Al2O3 and Supported Pd Three-Way-Catalyst

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通讯作者: 陈斌, bchen63@163.com

Application of Ultrasonic Vibrations in the Preparation of Ce-Zr-La/Al₂O₃ and Supported Pd Three-Way-Catalyst