디젤엔진의 NOx 저감을 위한 SCR DeNOx 촉매의 모델링 및 성능해석

Abstract

The steady-state kinetics of the selective catalytic reduction (SCR) of NOx with NH3 has been investigated over a commercial V2O5/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) mechanism is adopted to describe the steady-state kinetic behavior of the V2O5/TiO2 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 NOx reduction efficiency for a wide range of inlet conditions such as space velocity, oxygen concentrations, water concentration, and NO2/NO ratio. The parametric investigations are performed to examine how the NH3 slip from a SCR DeNOx catalyst and the conversion of NOx are affected by the reaction temperature, NH3/NOx feed ratio, and space velocity for feed gas compositions with NO2/NOx ratios of 0 and 0.5.