Effect of H2SO4 pretreatment on alkali-resistance performance of FeZrCeTiOx/TNT catalyst for NH3-SCR reaction

CeTiOx catalyst has attracted extensive attention for its superior activity and N2 selectivity for NH3-SCR reaction. However, it still suffers a lot from the deactivation by alkali metals. Thus, it is vital to develop some novel alkali resistant CeTiOx catalysts for application. In this work, we loaded FeZrCeTiOx component on TiO2 nanotube (TNT) support to obtain FeZrCeTiOx/TNT (FZCT/TNT) catalyst, and then simply pretreated it with H(2)SO(4 )to obtain H2SO4-pretreated FeZrCeTiOx/TNT (SFZCT/TNT) catalyst. Besides, the effects of H2SO4 pretreatment on catalytic performance, alkali-resistance as well as physicochemical properties of FZCT/TNT catalyst are comprehensively analyzed. The results manifest that excellent catalytic performance and alkali-resistance (mainly in 350-500 C) are both achieved by simple H2SO4 pretreatment with only small amounts of active components. This can be mainly attributed to the enhanced acid sites (especially B acid), the prompted adsorption and activation of NH3 species and the inhibited too strong adsorption strength of NOx species.

Automated summary

In this study, a catalyst with superior catalytic performance and alkali resistance was prepared by loading FeZrCeTiOx on a TiO2 nanotube support and treating it with H2SO4.