物理化学学报 >> 2005, Vol. 21 >> Issue (03): 255-260.doi: 10.3866/PKU.WHXB20050306

研究论文 上一篇    下一篇

等离子体在同时去除NOx和碳烟催化反应中的作用

裴梅香; 林赫; 上官文峰; 黄震   

  1. 上海交通大学机械与动力学院,燃烧与环境技术研究中心,上海　200030
  • 收稿日期:2004-07-19 修回日期:2004-09-29 发布日期:2005-03-15
  • 通讯作者: 上官文峰 E-mail:shangguan@sjtu.edu.cn

The Effects of Plasma on Simultaneously Catalytic Removal of NOx and Soot

PEI Mei-Xiang; LIN He; SHANGGUAN Wen-Feng; HUANG Zhen   

  1. Research Center for Combustion and Environmental Technology, School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai　200030
  • Received:2004-07-19 Revised:2004-09-29 Published:2005-03-15
  • Contact: SHANGGUAN Wen-Feng E-mail:shangguan@sjtu.edu.cn

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摘要： 采用程序升温反应(TPR)技术,研究了等离子体辅助同时催化去除富氧柴油机尾气中NOx和碳烟(soot)的反应特性.研究结果表明,等离子体提高了同时去除NOx-soot的催化反应活性,降低了碳烟的燃烧温度,使碳烟起燃温度从300 ℃降到280 ℃,燃尽温度从425 ℃降到380 ℃;同时,等离子体辅助提高了NOx转化为N2的效率,使催化选择性从1.12％提高到1.53％.本文还分别研究了在NO和O2的环境中,有或没有等离子体作用下,碳烟在催化作用下的去除特性.等离子体作用使得NO在和O2共存、只有NO和只有O2存在的各种条件下,碳烟的催化燃烧活性都有不同程度的提高,促进了N2的生成.此外,本文也对等离子体辅助同时催化去除NOx-soot的机理进行了探讨.

关键词: 氮氧化物, 碳烟, 柴油机排放, 同时去除, 等离子体辅助催化

Abstract: The simultaneous removal of NOx and soot was studied by the temperature program reaction (TPR) technology over La0.8K0.2MnO3 catalyst assisted by plasma. When the experiment was carried out by catalysis process, the results showed that La0.8K0.2MnO3 catalyst had the excellent catalytic performance for the reduction of NOx by soot in the oxygen rich atmosphere. When the experiment was conducted by catalysis with the assistant of plasma in the same gases condition, the results showed that plasma improved the catalytic activity for simultaneous removal of NOx and soot, and reduced the combustion temperature of soot. As a consequence, the ignition temperature of soot was reduced from 300 ℃ to 280 ℃, and the burning out temperature was also decreased from 425 ℃ to 380 ℃. The conversion efficiency of NOx to N2 was improved by plasma, and the selectivity to N2 formation was enhanced from 1.12％ to 1.53％. In addition, the catalytic property for soot removal was studied at various gas compositions with or without plasma. The results also showed that plasma improved the catalytic activity for the combustion of soot and the conversion efficiency of NOx to N2 whether in the NO＋O2 or NO atmosphere. Also, the mechanism of plasma-assisted catalysis for simultaneous removal of NOx and soot was discussed in this paper.

Key words: NOx, Soot, Diesel engine emission, Simultaneous removal, 　Plasma assisted catalysis