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Acta Physico-Chimica Sinica  2009, Vol. 25 Issue (01): 79-85    DOI: 10.3866/PKU.WHXB20090114
Article     
Simultaneous Catalytic Removal of NOx and Diesel Soot over Cu-Containing Hydrotalcite Derived Catalysts
WANG Zhong-Peng; CHEN Ming-Xia; SHANGGUAN Wen-Feng
Research Center for Combustion and Environmental Technology, School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China; School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China
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Abstract  Copper-containing mixed oxides (CuAlO) were derived from hydrotalcites and prepared by co-precipitation and thermal evolution methods. The catalytic activity of the CuAlO was investigated for the simultaneous catalytic removal of NOx and diesel soot particulates by a temperature-programmed reaction (TPR) technique in a fixed-bed flow reactor. CuAlO showed good activity for the NOx-soot removal reaction under both tight and loose contact conditions. When the contact conditions between catalyst and soot changed from tight to loose, the ignition temperature (Ti) increased from 260 ℃ to 314 ℃ while the maximum conversion of NO to N2 (XN2-max) decreased from 40.4%to 29.2%. Soot content had no effect on the ignition temperature and all the Ti values were about 260 ℃ for different soot content. With an increase in NO concentration or O2 concentration the Ti value decreased. XN2-max values were about 40% when the O2 concentration changed from 2.5% to 7.5%. The total flow rate had no effect on the Ti values, while the XN2-max decreased from40.4%to 21.6%when the total flowrate increased from20 to 80 mL·min-1. Catalytic activity decreased when the catalyst was reused and this decrease may be related to an intermediate absorbed on the catalyst surface.

Key wordsHydrotalcite      Mixed oxide      Soot      NOx      Catalytic removal     
Received: 14 July 2008      Published: 12 November 2008
MSC2000:  O643  
Corresponding Authors: SHANGGUAN Wen-Feng     E-mail: shangguan@sjtu.edu.cn
Cite this article:

WANG Zhong-Peng; CHEN Ming-Xia; SHANGGUAN Wen-Feng. Simultaneous Catalytic Removal of NOx and Diesel Soot over Cu-Containing Hydrotalcite Derived Catalysts. Acta Physico-Chimica Sinica, 2009, 25(01): 79-85.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20090114     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2009/V25/I01/79

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