담체일체형 압출 SCR 촉매를 이용한 저온 활성 향상

The performance of diesel engine is more excellent than gasoline engine"s in terms of a fuel efficiency and durability so that it can be applied to a heavy duty commercial vehicle. However, the NOx and PM emitted from the diesel engine are remained to overcome and its regulation is reinforced recently. To this reason DPF system are becoming more common from Euro-4 regulation and effective DeNOxsystem is required for satisfying future regulation. Urea-SCR in these DeNOx system is emerging as the best solution in commercial vehicle. This technique is well known since several years and derived from the exhaust gas treatment of power plants and stationary engines. Honeycomb shaped catalysts(coated catalyst) based on titanium dioxide containing active component are used predominantly. In this paper extrusive SCR catalyst without inactive support substrate is introduced and compared with coating catalyst in DeNOx performance.