Synergistic Effect of Ce-W in CeO2-WO3/TiO2 Catalyst on Performance of NH3-SCR Reaction
Three kinds of CeO2-WO3/TiO2 catalysts were prepared by impregnating 15％CeO2 and WO3 on TiO2 supports with different specific surface areas,and their activities in ammonia selective catalytic reduction of NOx(NH3-SCR)were investigated.The physical and chemical properties of the catalysts,such as the structure,mor-phology and the state of Ce-W species,were systematically studied by means of various characterization meth-ods.The results show that more Ce and W species are enriched on the low specific surface area TiO2 support,and the significant synergistic effect between them results in more Cen+-O2--Wn+oxygen bridge bonds in the cata-lyst.Cen+-O2--Wn+can promote the formation of Ce3+and oxygen deficiency,and then improve the low tempera-ture denitration performance of the catalyst.However,Ce and W species are more likely to enter into the TiO2 support with high specific surface area,or highly disperse on the surface of the carrier,which will lead to weak-ened interaction,so the low temperature activity of the obtained catalyst is relatively poor.
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