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Modeling and Performance Analysis of SCR $DeNO_X$ Catalyst for Reducing $NO_X$ Emissions in Diesel Engine  

Kim, Young-Deuk (Department of Mechanical Engineering, Hanyang University)
Kim, Woo-Seung (Department of Mechanical Engineering, Hanyang University)
Lee, Chun-Hwan (Environmental Parts R&D Center, Korea Automotive Technology Institute)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.17, no.1, 2009 , pp. 137-145 More about this Journal
Abstract
The steady-state kinetics of the selective catalytic reduction (SCR) of $NO_X$ with $NH_3$ has been investigated over a commercial ${V_2}{O_5}/TiO_2$ catalyst. In order to account for the influence of transport effects the kinetics are coupled with a fully transient two-phase 1D+1D monolith channel model. The Langmuir-Hinshelwood (L-H) mechanism is adopted to describe the steady-state kinetic behavior of the ${V_2}{O_5}/TiO_2$ catalyst. The reaction rate expressions are based on previously reported papers and are modified to fit the experimental data. The steady-state chemical reaction scheme used in the present mathematical model has been validated extensively with experimental data of selective $NO_X$ reduction efficiency for a wide range of inlet conditions such as space velocity, oxygen concentrations, water concentration, and $NO_2/NO$ ratio. The parametric investigations are performed to examine how the $NH_3$ slip from a SCR $DeNO_X$ catalyst and the conversion of $NO_X$ are affected by the reaction temperature, $NH_3/NO_X$ feed ratio, and space velocity for feed gas compositions with $NO_2/NO_X$ ratios of 0 and 0.5.
Keywords
SCR(Selective Catalytic Reduction); $NH_3$; $NO_X$; Mathematical modeling; Numerical analysis;
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