Effects of Surfactants on the Structure and Catalytic Performance of Fe-Mn /ZSM-5 /CC Monolithic Honeycomb Catalyst

Fe-Mn /ZSM-5 slurries were added with different surfactants such as PVA,PEG4000 and CMC,and coated on cordierite honeycomb carriers to prepare Fe-Mn /ZSM-5 m onolithic catalysts. The effects of different surfactants and additive amount of PEG4000 on the coating efficiency and the SCR performance of Fe-Mn /ZSM-5 monolithic catalysts were investigated. The results indicated that the coating efficiency and the catalytic activities of monolithic catalysts were significantly affected by the types and contents of surfactants. When adding 15%PEG4000,the coating efficiency and the coating stability of slurry reached the best level. The monolithic catalyst also exhibited the best catalytic activity,with NOxconversion of more than 95% in the reaction temperature range of160 ~ 430 ℃. Moreover,the surface morphology,micropore structure and coating uniformity of the honeycomb monolithic catalyst were analyzed by XRD,nitrogen adsorption desorption and SEM techniques. It can be found that the SCR catalytic activity of monolithic catalyst is correlated to the uniformity and coverage of coating layer formed on cordierite surface,and the presence of micropore structure also can improve the activity of the honeycomb monolithic catalysts.