Study of catalytic reduction of NOx in exhaust gas from a diesel engine

被引:34
作者
Morimune, T
Yamaguchi, H
Yasukawa, Y
机构
[1] Shonan Inst Technol, Dept Mech Engn, Kanagawa, Japan
[2] Tokyo Metropolitan Univ, Dept Mech Engn, Tokyo, Japan
关键词
combustion exhaust gas; diesel engine; pollution; selective catalytic reduction; urea solution; NOx removal rate; N2O emission;
D O I
10.1016/S0894-1777(98)10025-0
中图分类号
O414.1 [热力学];
学科分类号
摘要
We experimentally evaluate applying a deoxidizer-injected TiO2-V2O5 catalyst reactor apparatus to reduce the concentration of NOx in the exhaust gas of a conventional diesel engine. In this application of selective catalytic reduction (SCR), the deoxidizer, i.e., a urea solution used as a reducing agent, is mixed with exhaust gas and the effects of reaction temperature, space/linear velocity, and the amount of urea solution on the NOx removal rate are considered. We found that (i) the catalytic material substantially reduces the NOx concentration at a catalyst bed temperature from 190 degrees C to 440 degrees C, (ii) the NOx removal rate is 95% at a reaction temperature of >400 degrees C and space velocity of 22 500 h(-1), (iii) the particulate matter (PM) contained in diesel exhaust probably causes a significant reduction in NOx removal, and (iv) the emission of N2O during the denitration process is <15 ppm. Also discussed are the results of an urban driving test using a diesel-engine truck equipped with the presented apparatus,as well as needed improvements associated with practical application. (C) 1998 Elsevier Science Inc. All rights reserved.
引用
收藏
页码:220 / 230
页数:11
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