Research Progress on Urea Decomposition in Selective Catalytic Reduction System

ZHANG Yujiao; HUANG Haozhong; ZHANG Lina; CHEN Yajuan

doi:10.3969/j.issn.1001-2222.2024.03.002

Vehicle Engine ›› 2024, Vol. 0 ›› Issue (3) : 10-17. DOI: 10.3969/j.issn.1001-2222.2024.03.002

Research Progress on Urea Decomposition in Selective Catalytic Reduction System

ZHANG Yujiao,HUANG Haozhong,ZHANG Lina,CHEN Yajuan

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Abstract

Selective catalytic reduction(SCR) technology is an effective means to reduce NO_x emissions. In the urea-SCR system of diesel engine, urea decomposition plays an important role in the NO_x reduction process. The current research status of urea decomposition was elaborated with a focus on discussing the reaction pathways and temperatures of by-products. In addition, the catalytic effect of catalysts on urea decomposition was briefly discussed, and four measures to reduce deposits were summarized. Finally, three directions for future technological improvement were proposed: studying the detailed reaction mechanism under actual operating conditions, using detailed decomposition mechanisms for numerical simulation while reducing time cost, and using catalysts to increase the reaction rate of intermediates.

Key words

selective catalytic reduction(SCR) / urea / decomposition / by-product / reaction mechanism

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ZHANG Yujiao,HUANG Haozhong,ZHANG Lina,CHEN Yajuan. Research Progress on Urea Decomposition in Selective Catalytic Reduction System[J]. Vehicle Engine. 2024, 0(3): 10-17 https://doi.org/10.3969/j.issn.1001-2222.2024.03.002