Transactions of Society of Automotive Engineers of Japan
Online ISSN : 1883-0811
Print ISSN : 0287-8321
ISSN-L : 0287-8321
A Study on the Improvement of NOx Reduction Efficiency for a Urea SCR System (Sixth Report)
―Clarifying N2O Formation Mechanism―
Wataru Matsui, Tetsu Suzuki, Yasuo Ohta, Yasuhiro Daisho, Hisakazu Suzuki, Hajime Ishii
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Keywords: heat engine, selective catalytic reduction NOx removal, emission gas, N2O
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2012 Volume 43 Issue 2 Pages 389-394

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Abstract
It is recognized that N2O, having 310 times CO2 global warming potential, tends to be produced due to NH3 slip from Urea SCR catalysts. To investigate N2O formation mechanism and reduce its emission, we have conducted both experiment and chemical kinetics simulation studies. The results have shown that the reactions associate with NH3 and NO produces N2O in the oxidation catalyst and its peak appears around a 200℃ exhaust gas temperature. It has also been found out that the catalytic volume and urea injection quantity should be optimized to prevent NH3 slip.
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© 2012 Society of Automotive Engineers of Japan, Inc.
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