Improving the denitration performance and K-poisoning resistance of the V2O5-WO3/TiO2 catalyst by Ce4+ and Zr4+ co-doping

doi:10.1016/S1872-2067(18)63184-5

Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (1): 95-104.DOI: 10.1016/S1872-2067(18)63184-5

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Improving the denitration performance and K-poisoning resistance of the V₂O₅-WO₃/TiO₂ catalyst by Ce⁴⁺ and Zr⁴⁺ co-doping

Jun Cao^a,b, Xiaojiang Yao^b, Fumo Yang^c, Li Chen^b, Min Fu^a, Changjin Tang^d, Lin Dong^d

a Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China;
b Research Center for Atmospheric Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;
c National Engineering Research Center for Flue Gas Desulfurization, School of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China;
d Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210093, Jiangsu, China

Received:2018-08-22 Revised:2018-09-28 Online:2019-01-18 Published:2018-11-09
Contact: 10.1016/S1872-2067(18)63184-5
Supported by:
This work was supported by the National Natural Science Foundation of China (21876168, 21507130), the Key Projects for Common Key Technology Innovation in Key Industries in Chongqing (cstc2016zdcy-ztzx0020-01), the Chongqing Science & Technology Commission (cstc2016jcyjA0070, cstckjcxljrc13), the Open Project Program of Chongqing Key Laboratory of Catalysis and Functional Organic Molecules from Chongqing Technology and Business University (1456029), and the Graduate Innovation Project of Chongqing Technology and Business University (yjscxx201803-028-22).

Abstract

Abstract:

A series of V₂O₅-WO₃/TiO₂-ZrO₂, V₂O₅-WO₃/TiO₂-CeO₂, and V₂O₅-WO₃/TiO₂-CeO₂-ZrO₂ catalysts were synthesized to improve the selective catalytic reduction (SCR) performance and the K-poisoning resistance of a V₂O₅-WO₃/TiO₂ catalyst. The physicochemical properties were investigated by using XRD, BET, NH₃-TPD, H₂-TPR, and XPS, and the catalytic performance and K-poisoning resistance were evaluated via a NH₃-SCR model reaction. Ce⁴⁺ and Zr⁴⁺ co-doping were found to enhance the conversion of NO_x, and exhibit the best K-poisoning resistance owing to the largest BET-specific surface area, pore volume, and total acid site concentration, as well as the minimal effects on the surface acidity and redox ability from K poisoning. The V₂O₅-WO₃/TiO₂-CeO₂-ZrO₂ catalyst also presents outstanding H₂O + SO₂ tolerance. Finally, the in situ DRIFTS reveals that the NH₃-SCR reaction over the V₂O₅-WO₃/TiO₂-CeO₂-ZrO₂ catalyst follows an L-H mechanism, and that K poisoning does not change the reaction mechanism.

Key words: V₂O₅-WO₃/TiO₂-CeO₂-ZrO₂ catalyst, Co-doping, K-poisoning, NH₃-SCR, Reaction mechanism

Jun Cao, Xiaojiang Yao, Fumo Yang, Li Chen, Min Fu, Changjin Tang, Lin Dong. Improving the denitration performance and K-poisoning resistance of the V₂O₅-WO₃/TiO₂ catalyst by Ce⁴⁺ and Zr⁴⁺ co-doping[J]. Chinese Journal of Catalysis, 2019, 40(1): 95-104.

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Improving the denitration performance and K-poisoning resistance of the V₂O₅-WO₃/TiO₂ catalyst by Ce⁴⁺ and Zr⁴⁺ co-doping

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