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[Wu Yanxia,Chen Yufeng,Liang Hailong,Hu Liming and Wang Chunpeng.Effect of Sn Doping on Alkali Metal Resistance of V/UiO-66 Catalyst[J].Rare Metal Materials and Engineering,2023,52(1):41~47.]
Effect of Sn Doping on Alkali Metal Resistance of V/UiO-66 Catalyst
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Received:April 07, 2022  Revised:August 05, 2022
Key words: UiO-66 catalyst  catalytic denitration  NH3-SCR  modification
Foundation item:NKR&DPC(2016YFC0209302)
Author NameAffiliation
Wu Yanxia,Chen Yufeng,Liang Hailong,Hu Liming and Wang Chunpeng  
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      V/UiO-66 catalyst and modified Sn-V/UiO-66 catalyst were prepared by impregnation method with UiO-66 as carrier, and their potassium poisoning was simulated. The reaction and deactivation mechanisms of vanadium-titanium catalyst were analyzed. Results demonstrate that the crystallographic form of catalysts barely changes after K-loading, and the specific surface area of the catalysts has an irregular fluctuation. The catalyst activity is decreased rapidly after the alkali metal was loaded due to the degraded metal redox performance and the rapidly decreased surface acid content of the catalysts. The addition of Sn can enhance the interaction between VOx and other components, which thereby increases the V5+ content and reducibility of VOx. Thus, VOx on the surface of Sn-V/UiO-66 catalysts can provide more acid sites. The poisoned K-Sn-V/UiO-66 catalyst still has high total acid content and strong redox property, presenting the high resistance of Sn-V/UiO-66 catalyst against alkali metal poisoning.