Low-Temperature Performances for Monolithic V2O5-WO3/TiO2 Catalyst in the NH3-SCR System

Abstract

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 O₂ 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.