Low-Temperature Performances For Monolithic V2o5-Wo3/Tio2 Catalyst In The Nh3-Scr System

According to the working characteristics of marine diesel engines, a SCR catalyst testing system was developed and catalytic activities of an extruded commercial monolithic V2O5-WO3/TiO2 catalyst at low temperatures were studied in this paper. Meanwhile, key parameters including catalytic temperature, space velocity, NH3 consumption, excess O-2 and NO2 concentration in the gas mixtures were also analyzed to enhance the low-temperature performances of marine SCR systems. It is found that desorption reaction of NH3 absorbed on the catalyst surface may be responsible for a sharply increasing of NH3 slip in a short time, which could also lead to the secondary pollution of NH3 from the SCR system.