디젤엔진의 NOx 저감을 위한 SCR DeNOx 촉매의 정상 및 비정상 성능 해석

Abstract

The steady- and unsteady-state kinetics of the selective catalytic reduction (SCR) of NOx with NH₃ has been investigated over a commercial V₂O?/TiO₂ 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) and Modified Redox (MR) mechanisms are adopted to describe the steady-state kinetic behavior of the V₂O?/TiO₂ catalyst, and their results are compared with each other. A Temkin-type kinetics is used to describe the ammonia adsorption/desorption rate. The reaction rate expressions are based on previously reported papers and are modified to fit the experimental data. The steady-state chemical reaction schemes used in the present mathematical model have been validated extensively with experimental data over a wide range of reaction temperatures.