SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 55 ›› Issue (3): 246-256.DOI: 10.1016/j.cjche.2022.05.031

• Full Length Article • 上一篇    下一篇

Superior resistance to alkali metal potassium of vanadium-based NH3-SCR catalyst promoted by the solid superacid SO42--TiO2

Yaoyao Peng1, Lei Song1, Siru Lu1, Ziyu Su1, Kui Ma1, Siyang Tang1, Shan Zhong1, Hairong Yue1,2, Bin Liang1,2   

  1. 1. Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
    2. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China
  • 收稿日期:2022-02-28 修回日期:2022-05-06 出版日期:2023-03-28 发布日期:2023-06-03
  • 通讯作者: Lei Song,E-mail:songlei@scu.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (22108184), China Postdoctoral Science Foundation (2021TQ0221), the Sichuan Science and Technology Program (2021JDRC0117) and Chengdu Science and Technology Program (2021-YF05-00378-SN). We thank Wen Tian for the experimental support with FTIR (Thermo Fisher iS 50).

Superior resistance to alkali metal potassium of vanadium-based NH3-SCR catalyst promoted by the solid superacid SO42--TiO2

Yaoyao Peng1, Lei Song1, Siru Lu1, Ziyu Su1, Kui Ma1, Siyang Tang1, Shan Zhong1, Hairong Yue1,2, Bin Liang1,2   

  1. 1. Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
    2. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China
  • Received:2022-02-28 Revised:2022-05-06 Online:2023-03-28 Published:2023-06-03
  • Contact: Lei Song,E-mail:songlei@scu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (22108184), China Postdoctoral Science Foundation (2021TQ0221), the Sichuan Science and Technology Program (2021JDRC0117) and Chengdu Science and Technology Program (2021-YF05-00378-SN). We thank Wen Tian for the experimental support with FTIR (Thermo Fisher iS 50).

摘要: The significant decrease of acid sites caused by alkali metal poisoning is the major factor in the deactivation of commercial V2O5-WO3/TiO2 NH3-SCR catalysts. In this work, the solid superacid SO42--TiO2 modified by sulfate radicals, was selected as the catalyst support, which showed superior potassium resistance. The physicochemical properties and K-poisoning resistance of the V2O5-WO3/SO42--TiO2 (VWSTi) catalyst were carried out by XRD, BET, H2-TPR, NH3-TPD, XPS, in situ DRIFTS and TG. The results pointed out that the introduction of SO42- significantly increased the NH3-SCR catalytic activity at high temperatures, with an exceptionally high NOx conversion over 90% between 275 ℃ and 500 ℃. When 0.5% (mass) K2O was doped on the catalysts, the catalytic performance of the traditional V2O5-WO3/TiO2 (VWTi) catalyst decreased significantly, while the VWSTi catalyst could still maintain a NOx conversion over 90% in the range of 300–500 ℃. The characterizations suggested that the support of SO42--TiO2 greatly increased the number of acidic sites, thereby enhancing the adsorption capacity of the reactant NH3. The results above demonstrated a potential approach to achieve superior potassium resistance for NH3-SCR catalysts using solid superacid.

关键词: Selective catalytic reduction (NH3-SCR), V2O5-WO3/TiO2, Solid superacid, Anti-poisoning, Acidity

Abstract: The significant decrease of acid sites caused by alkali metal poisoning is the major factor in the deactivation of commercial V2O5-WO3/TiO2 NH3-SCR catalysts. In this work, the solid superacid SO42--TiO2 modified by sulfate radicals, was selected as the catalyst support, which showed superior potassium resistance. The physicochemical properties and K-poisoning resistance of the V2O5-WO3/SO42--TiO2 (VWSTi) catalyst were carried out by XRD, BET, H2-TPR, NH3-TPD, XPS, in situ DRIFTS and TG. The results pointed out that the introduction of SO42- significantly increased the NH3-SCR catalytic activity at high temperatures, with an exceptionally high NOx conversion over 90% between 275 ℃ and 500 ℃. When 0.5% (mass) K2O was doped on the catalysts, the catalytic performance of the traditional V2O5-WO3/TiO2 (VWTi) catalyst decreased significantly, while the VWSTi catalyst could still maintain a NOx conversion over 90% in the range of 300–500 ℃. The characterizations suggested that the support of SO42--TiO2 greatly increased the number of acidic sites, thereby enhancing the adsorption capacity of the reactant NH3. The results above demonstrated a potential approach to achieve superior potassium resistance for NH3-SCR catalysts using solid superacid.

Key words: Selective catalytic reduction (NH3-SCR), V2O5-WO3/TiO2, Solid superacid, Anti-poisoning, Acidity