Ca is selected as a representative alkaline earth metal poisoning substance for catalyst,and fresh CeWTi catalysts and Ca-CeWTi catalysts with different Ca loading amount are prepared via impregnation method.The changing rule of denitrification activity of Ca-poisoned CeWTi catalysts and Ca’s impact on CeWTi catalysts are analyzed through the catalyst denitrification activity test and the characterization means,such as NH3-TPD,H2-TPR and XPS.It is found that the declining degree of catalytic efficiency of CeWTi catalyst after Ca poisoning is positively correlated with Ca loading amount,and the addition of Ca leads to a significant decrease in the physical properties of the catalyst,such as specific surface area and total pore volume,a significant decrease in the redox performance,a decrease in the content of lattice oxygen on the surface of the catalyst,and a decrease in the overall number of acid sites,which are the main reasons for the decrease in the performance of the catalyst and the shift of the temperature window to the high-temperature section.
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