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Citation: Changming Chen, Xiaodong Wu, Wenchao Yu, Yuxi Gao, Duan Weng, Lei Shi, Chunlei Geng. Potassium poisoning of titania supported deNO_x catalysts: Preservation of vanadia and sacrifice of tungsten oxide[J]. Chinese Journal of Catalysis, ;2015, 36(8): 1287-1294. doi: 10.1016/S1872-2067(15)60881-6 shu

Potassium poisoning of titania supported deNO_x catalysts: Preservation of vanadia and sacrifice of tungsten oxide

1.
a Key Laboratory of Advance Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

Corresponding author: Xiaodong Wu,
Received Date: 27 March 2015
Available Online: 28 April 2015
Fund Project: 国家高技术研究发展计划(863计划, 2013AA065302) (863计划, 2013AA065302) 固废资源化利用与节能建材国家重点实验室开放课题(SWR-2013-003). (SWR-2013-003)

V₂O₅-WO₃/TiO₂ catalysts were prepared by a wet impregnation method, and the deactivation by KCl of their catalytic activity for selective catalytic reduction of NO_x by NH₃ (NH₃-SCR) was investigated. The fresh and poisoned catalysts were characterized by inductively coupled plasma (ICP), N₂ adsorption, Raman spectroscopy, H₂ temperature-programmed reduction, IR spectroscopy of adsorbed NH₃, and NH₃ oxidation. Vanadia species, which are the active sites for the SCR reaction, were turned into inert potassium vanadate, but they were partially maintained on the catalyst at a high vanadia loading. Tungsten oxide acts as a sacrificial agent that reacts with potassium to form potassium tungstate in addition to its roles in increasing the surface acidity of the catalyst and facilitating the dispersion of vanadia. The V₂O₅-WO₃/TiO₂ catalyst at a high vanadia loading exhibited the best resistance to alkali poisoning.
- Vanadia,
- Tungsten oxide,
- Selective catalytic reduction,
- Alkali deactivation,
- Active site,
- Sacrificial agent
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Potassium poisoning of titania supported deNOx catalysts: Preservation of vanadia and sacrifice of tungsten oxide

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通讯作者: 陈斌, bchen63@163.com

Potassium poisoning of titania supported deNO_x catalysts: Preservation of vanadia and sacrifice of tungsten oxide