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Improvement in Selective Catalytic Reduction Model Accuracy for Predicting NO Conversion at High Temperature

SAE Technical Papers, ISSN: 0148-7191, Vol: 2018-April
2018
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Conference Paper Description

As a result of WNTE regulations and the introduction of close-coupled aftertreatment systems, exhaust purification at high temperatures in commercial vehicles has become increasingly important in recent years. In this report, we improve the prediction accuracy for NO conversion at high temperatures in the kinetic model of conventional Cu-selective catalytic reduction (Cu-SCR). Reaction rate analysis indicated that the rate of NH oxidation was extremely low compared to the rate of standard SCR. We found that NO concentration-dependent NH oxidations (termed NO-assisted NH oxidations) were key to the rate of NH oxidation. The output of the improved Cu-SCR kinetic model was in agreed with experimental results obtained from the synthetic gas bench and engine dynamometer bench. We analyzed the contribution of each reaction to NH consumption during Cu-SCR. Under NH + NO + O, standard SCR was dominant at low temperature. At high temperatures, the rate of NO-assisted NH oxidation increased, and this reaction competed with standard SCR. Under NH + NO + NO + O, fast SCR, NHNO formation, and standard SCR were the dominant reactions at low temperature. With increasing temperature, NO-assisted NH oxidation competed with the other reactions, resulting in a decreased NO conversion.

Bibliographic Details

Kohei Oka; Teppei Ohori; Yutaka Itagaki; Kazuo Osumi; Naoya Ishikawa; Yuuki Dobashi; Eiji Wako

SAE International

Engineering; Environmental Science

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