物理化学学报 >> 2011, Vol. 27 >> Issue (04): 925-931.doi: 10.3866/PKU.WHXB20110343

催化和表面科学 上一篇    下一篇

Ce0.5+xZr0.4-xLa0.1O2-Al2O3催化剂催化燃烧柴油车碳烟

朱艺, 王健礼, 陈永东, 廖传文, 王世丹, 龚茂初, 陈耀强   

  1. 四川大学化学学院, 成都 610064
  • 收稿日期:2010-10-20 修回日期:2010-12-22 发布日期:2011-03-29
  • 通讯作者: 陈耀强 E-mail:nic7501@scu.edu.cn
  • 基金资助:

    国家自然科学基金(20773090)和教育部博士点基金(20080610009)资助项目

Catalytic Combustion of Diesel Soot over Ce0.5+xZr0.4-xLa0.1O2-Al2O3 Catalysts

ZHU Yi, WANG Jian-Li, CHEN Yong-Dong, LIAO Chuan-Wen, WANG Shi-Dan, GONG Mao-Chu, CHEN Yao-Qiang   

  1. College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
  • Received:2010-10-20 Revised:2010-12-22 Published:2011-03-29
  • Contact: CHEN Yao-Qiang E-mail:nic7501@scu.edu.cn
  • Supported by:

    The projected was supported by the National Natural Science Foundation of China (20773090) and Research Fund for Ph.D. Program of the Ministry of Education, China (20080610009).

摘要:

采用共沉淀法制备了系列Ce0.5+xZr0.4-xLa0.1O2-Al2O3催化剂, 其中0≤x≤0.4且Ce0.5+xZr0.4-xLa0.1O2与Al2O3的质量比为1:1. 考察了该系列催化剂对柴油车排放碳烟的催化燃烧性能, 并用低温N2吸附-脱附、X射线衍射(XRD)、X射线光电子能谱(XPS)、氢气程序升温还原(H2-TPR)和氧气程序升温脱附(O2-TPD)等手段对催化剂进行了表征. 研究结果表明该系列催化剂均形成了具有立方萤石结构的固溶体. 当x=0.2时, Ce3+离子在催化剂表面有一定的富集, 此时催化剂具有最大的β氧脱附峰和最好的表面还原性能, 同时具有良好的催化碳烟氧化活性, 碳烟在该催化剂的起燃温度为360 °C, 具有较好的应用前景.

关键词: 固溶体, 碳烟, 柴油机, 催化燃烧

Abstract:

Ce0.5+x Zr0.4-x La0.1O2-Al2O3 catalysts were prepared by co-precipitation, where 0≤x≤0.4 and the mass ratio of Ce0.5+xZr0.4-xLa0.1O2:Al2O3 was 1:1. The catalytic activities of these catalysts for the catalytic combustion of diesel soot were investigated. The catalysts were further characterized by low temperature nitrogen adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2- temperature-programmed reduction (H2-TPR), and O2-temperature-programmed desorption (O2-TPD). The results showed that all the catalysts formed solid solutions with a fluorite-like structure. When x=0.2, the Ce3+ ions were partly rich on the surface of the catalyst. The catalyst was easily reduced by H2 and the desorption peak area of the β oxygen species was the largest. The light-off temperature was 360 °C for the catalytic combustion of diesel soot over the catalyst suggesting good catalytic activity and potential application in diesel soot catalytic combustion.

Key words: Solid solution, Soot, Diesel, Catalytic combustion

MSC2000: 

  • O643