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

doi:10.1016/j.cjche.2022.05.031

Chinese Journal of Chemical Engineering ›› 2023, Vol. 55 ›› Issue (3): 246-256.DOI: 10.1016/j.cjche.2022.05.031

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Superior resistance to alkali metal potassium of vanadium-based NH₃-SCR catalyst promoted by the solid superacid SO₄^2--TiO₂

Yaoyao Peng¹, Lei Song¹, Siru Lu¹, Ziyu Su¹, Kui Ma¹, Siyang Tang¹, Shan Zhong¹, Hairong Yue^1,2, Bin Liang^1,2

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:2023-06-03 Published:2023-03-28
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).

Superior resistance to alkali metal potassium of vanadium-based NH₃-SCR catalyst promoted by the solid superacid SO₄^2--TiO₂

Yaoyao Peng¹, Lei Song¹, Siru Lu¹, Ziyu Su¹, Kui Ma¹, Siyang Tang¹, Shan Zhong¹, Hairong Yue^1,2, Bin Liang^1,2

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

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).

Abstract

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 SO₄^2--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/SO₄^2--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 SO₄^2- significantly increased the NH₃-SCR catalytic activity at high temperatures, with an exceptionally high NO_x 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 NO_x conversion over 90% in the range of 300–500 ℃. The characterizations suggested that the support of SO₄^2--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

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 SO₄^2--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/SO₄^2--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 SO₄^2- significantly increased the NH₃-SCR catalytic activity at high temperatures, with an exceptionally high NO_x 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 NO_x conversion over 90% in the range of 300–500 ℃. The characterizations suggested that the support of SO₄^2--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

Yaoyao Peng, Lei Song, Siru Lu, Ziyu Su, Kui Ma, Siyang Tang, Shan Zhong, Hairong Yue, Bin Liang. Superior resistance to alkali metal potassium of vanadium-based NH₃-SCR catalyst promoted by the solid superacid SO₄^2--TiO₂[J]. Chinese Journal of Chemical Engineering, 2023, 55(3): 246-256.

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Superior resistance to alkali metal potassium of vanadium-based NH₃-SCR catalyst promoted by the solid superacid SO₄^2--TiO₂

Superior resistance to alkali metal potassium of vanadium-based NH₃-SCR catalyst promoted by the solid superacid SO₄^2--TiO₂

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