Citation: KONG Ming, LIU Qing-cai, ZHAO Dong, REN Shan, MENG Fei. Synergy of NaCl and Hg⁰ on V₂O₅-WO₃/TiO₂ SCR catalysts[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(12): 1504-1509. shu

Synergy of NaCl and Hg⁰ on V₂O₅-WO₃/TiO₂ SCR catalysts

1.
Engineering Research Center for Energy and Environment of Chongqing, College of Materials Science and Engineering of Chongqing University, Chongqing 400044, China

Corresponding author: REN Shan,
Received Date: 18 May 2015
Available Online: 21 July 2015
Fund Project: 国家自然科学基金(51274263,51204220) (51274263,51204220)重庆市自然科学基金(cstc2013jjB0035)资助项目 (cstc2013jjB0035)

The nano V₂O₅-WO₃/TiO₂ catalysts were prepared. NaCl was loaded on the catalysts by impregnation and Hg⁰ was loaded by adsorption. The samples were characterized by XRD, SEM, BET, NH₃-TPD and FT-IR measurements to investigate the effect of NaCl and Hg⁰ on the performance of V₂O₅-WO₃/TiO₂ SCR catalysts. Besides, the functional mechanism was proposed combining with previous conclusions. The results indicate that NaCl causes the agglomeration of catalysts, leading to the decrease of BET surface area. For NaCl poisoning catalysts, the deactivation is observed obviously with the increase of NaCl loadings. Brønsted acid sites (-V-OH) are neutralized by Na to ultimately form -V-O-Na and Cl-V-O-Na, resulting in the decline of catalytic activity. Hg⁰ shows no influence on the microstructure and phase composition of the catalysts. However, it can be adsorbed on the V active sites to weaken the De-NO_x activities slightly. When NaCl and Hg⁰ exist simultaneously, Hg⁰ will combine with Cl that is introduced from NaCl to form HgCl or HgCl₂ and partly replace Na, and -V-O…Hg or-V-O-Hg-Cl is produced finally.
- synergy,
- V₂O₅-WO₃/TiO₂ catalyst,
- NaCl,
- Hg⁰,
- deactivation
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沈阳化工大学材料科学与工程学院沈阳 110142

Synergy of NaCl and Hg0 on V2O5-WO3/TiO2 SCR catalysts

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通讯作者: 陈斌, bchen63@163.com

Synergy of NaCl and Hg⁰ on V₂O₅-WO₃/TiO₂ SCR catalysts