Modeling of Monolith Reactor Washcoated with CuZSM5 Catalyst for Removing NO from Diesel Engine by Urea

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• 作者：Joon Hyun Baik ; Sung Dae Yim ; In-Sik Nam ; Young Sun Mok ; Jong-Hwan Lee ; Byong K. Cho ; and Se H. Oh
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2006
• 出版时间：July 19, 2006
• 年：2006
• 卷：45
• 期：15
• 页码：5258 - 5267
• 全文大小：391K
• 年卷期：v.45,no.15(July 19, 2006)
• ISSN：1520-5045

文摘

Two sets of reaction kinetics based upon the experimental data independently obtained for NH₃-SCR andurea decomposition reactions over CuZSM5 catalyst have been deduced to design the urea-SCR process forapplication to heavy-duty diesel engines. They were finally employed simultaneously to simulate the commercialperformance of a monolith reactor for the urea-SCR process. The monolith reactor washcoated with theCuZSM5 catalyst was prepared and its SCR activity was evaluated to confirm the reaction kinetics and thereactor model developed in the present study for its commercial application. The monolith reactor modelincluding the mass-transfer resistance directly employs the kinetic parameters obtained from the kinetic studyover a packed-bed flow reactor containing 20/30 mesh powder type of CuZSM5 catalyst. The kinetic andmonolith reactor models developed in the present study well predict the reactor performance of the urea-SCRprocess. The model is also capable of describing the effect of the reaction conditions, a critical issue for thecommercial operation of the urea-SCR process to the automotive engine, including the reactor space velocity,NH₃ (and/or urea)/NO feed ratio, NH₃ and urea slips, and the temperature of the thermal decompositionreactor on the NO removal activity.