Effect of Temperature on Reduction of NOx and Soot in Diesel Exhaust with Perovskite-type Catalysts

A catalyst of the nanosized perovskite-type La0.8K0.2MnO3 (denoted as LKMO) was prepared by citric acid complexation method. The catalyst was characterized by X-ray diffraction analysis (XRD), scanning electron microscope (SEM) and surface area and porosity analyzer (BET). Results showed that the LKMO catalyst presents a rather regular porous structure, in which the pores are distributed from about 50 to 700 nm. The bench test was carried out, and the effect of temperature on the reduction of NOx and PM in diesel engine emissions over LKMO catalyst had been investigated. The result shows that the LKMO catalyst exhibits good activities for the simultaneous removal of NOx and soot.