Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (03): 255-260.doi: 10.3866/PKU.WHXB20050306

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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

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