Research on de-NO by low-temperature SCR based on MnOx-CeO2/PPSN

Polyphenylene sulfide (PPS) filter was treated by nitric acid to form PPSN filter. 40% manganese molar fraction of MnOx-CeO2 was loaded on PPSN filter using ultrasonic method, and calcined at 400°C to form MnOx-CeO2/PPSN. The activity of MnOx-CeO2/PPSN was tested in the presence of NH3 as reducing agent for selective catalytic reduction of NO. The influences of catalyst temperature, volume fraction of NH3 and O2, and catalyst loadings on the de-NO efficiency were studied. It was found that MnOx-CeO2/PPSN filter with catalyst loading of 296 g/m2 showed higher de-NO efficiency under temperature of 130–160°C, NH3/NO ratio of 1, and O2 concentration of 5%. When the catalyst temperature and volume fraction of NH3 and O2 were constant, de-NO efficiency of MnOx-CeO2/PPSN was higher with increasing catalyst loading.