Cerium promotion on the hydrocarbon resistance of a Cu-SAPO-34 NH3-SCR monolith catalyst

CuCe-SAPO-34 (CuCe-x) catalysts with 3 wt% Cu and various content of Ce for selective catalytic reduction of NOx by NH3 (NH3-SCR) were prepared by a wet co-impregnation method. The activities of the CuCe-x catalysts were better than that of Cu-SAPO-34 (Cu). In addition, the hydrocarbon (HC) resistance of the CuCe-x catalysts was examined and compared to that of the Cu catalyst. The NH3-SCR performance after C3H6 poisoning of the CuCe-x catalysts was preferable to that of the Cu catalyst, since the C3H6 oxidation performance was improved by the addition of Ce. The XRD, UV-vis-DRS and H2-TPR results confirmed that the addition of Ce could inhibit the aggregation of CuO crystallites and increase the amount of isolated copper ions. Furthermore, the NH3-TPD and TGA results demonstrated that the addition of Ce decreased the amount and strength of strong acid sites, so that the amount of C3H6/O2 adsorption on the CuCe-x catalysts was lower than that on the Cu catalyst. Therefore, the activity and HC resistance of Cu-SAPO-34 was improved by the addition of Ce.

Duke Scholars

Author Li Lan Molecular Genetics and Microbiology