Preparation and Denitrifying Performance of V2O5-MoO3/TiO2-CeO2/H-Mordenite

Abstract

With MoO₃ as additive, V₂O₅ coatings was loaded to H-mordenite zeolite-TiO₂ composite carrier to prepare V₂O₅-MoO₃/ TiO₂-CeO₂/HM as NO_x SCR catalyst. X-Ray diffraction, N₂ adsorption-desorption and NH₃ temperature programmed desorption (NH₃-TPD) techniques were used to characterize the structure, surface area, acidity of the catalyst. Denitration performance of the catalyst was investigated using fixed-bed micro-reactor. The effect of V₂O₅ content on denitrification performance was studied extensively. Experimental results show that H-mordenite zeolite is beneficial to increase the specific surface area of the TiO₂ support and improve V₂O₅ dispersing on the carrier in a monolayer state. The catalyst with 8 % V₂O₅ load displays optimal denitration performance. When the V₂O₅ load ³ 8 % V₂O₅, the catalytic activity decrease. MoO₃ has help to vanadium-base catalyst and the denitration performance of the V₂O₅/CeO₂-TiO₂/HM with MoO₃ additive increased and NO conversion reached to 92 %.