摘要
Abstract
Selective catalytic reduction(SCR)is currently the most widely used industrial NOx removal technology.TiO2 supported vanadium-based catalysts are the most widely used commercial catalysts.However,there are still many problems to be addressed,such as poor low-temperature(<300℃)activity,narrow temperature activity window(300-400℃),and high vanadium toxicity,which limits their application in low temperature flue gas industry.Consequently,the development of high-performance low-temperature SCR catalysts is an important direction of research.Mn and Ce,due to their good low-temperature performance,were selected as the active components,and Mo doping was used to enhance the SO2 resistance of the catalyst.The catalyst samples were characterized by N2 adsorption and desorption,X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and Fourier transform infrared(FTIR).The results showed that the presence of SO2 lowered the NH3-SCR activity of the Mn2.5Ce1/SiC catalyst,while Mo modification could reduce the inhibitory effect.SO2 would compete with NH3 for adsorption on the catalyst surface,thereby inhibiting the NH3-SCR activity of the catalyst.When the molar ratio of Mn∶Ce∶Mo was 2.5∶1∶0.07,the catalyst achieved the best performance,of which the denitrification performance and anti-SO2 poisoning performance were better than that of the Mn2.5Ce1/SiC catalyst without Mo doping.The Mo modification increased the adsorbed oxygen content on the catalyst surface and weakened the poisoning effect of SO2 on the catalyst surface.关键词
选择催化还原/催化剂/低温/烟道气/煤燃烧/Mo改性Key words
selective catalytic reduction(SCR)/catalyst/low-temperature/flue gas/coal combustion/Mo modification分类
化学化工
