Research Progress on Urea Decomposition in Selective Catalytic Reduction System
Selective catalytic reduction(SCR)technology is an effective means to reduce NOx emissions.In the urea-SCR sys-tem of diesel engine,urea decomposition plays an important role in the NOx 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 addi-tion,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 reduc-ing time cost,and using catalysts to increase the reaction rate of intermediates.
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