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Chemical deactivation of V2O5-WO3/TiO2 SCR catalyst by combined effect of potassium and chloride

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Abstract

V2O5-WO3/TiO2 catalyst was poisoned by impregnation with NH4Cl, KOH and KCl solution, respectively. The catalysts were characterized by X-ray diffraction (XRD), inductively coupled plasma (ICP), N2 physisorption, Raman, UV-vis, NH3 adsorption, temperature-programmed reduction of hydrogen (H2-TPR), temperature-programmed oxidation of ammonia (NH3-TPO) and selective catalytic reduction of NO x with ammonia (NH3-SCR). The deactivation effects of poisoning agents follow the sequence of KCl>KOH≫NH4Cl. The addition of ammonia chloride enlarges the pore size of the titania support, and promotes the formation of highly dispersed V = O vanadyl which improves the oxidation of ammonia and the high-temperature SCR activity. K+ ions are suggested to interact with vanadium and tungsten species chemically, resulting in a poor redox property of catalyst. More importantly, potassium can reduce the Brønsted acidity of catalysts and decrease the stability of Brønsted acid sites significantly. The more severe deactivation of the KCl-treated catalyst can be mainly ascribed to the higher amount of potassium resided on catalyst.

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Authors and Affiliations

  1. State Key Laboratory of New Ceramics & Fine Process, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Xiaodong Wu, Wenchao Yu & Duan Weng

  2. Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China

    Xiaodong Wu, Zhichun Si & Duan Weng

  3. Yangtze Delta Region Institute of Tsinghua University, Jiaxing, 314000, China

    Xiaodong Wu

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  1. Xiaodong Wu
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  2. Wenchao Yu
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Correspondence to Xiaodong Wu.

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Wu, X., Yu, W., Si, Z. et al. Chemical deactivation of V2O5-WO3/TiO2 SCR catalyst by combined effect of potassium and chloride. Front. Environ. Sci. Eng. 7, 420–427 (2013). https://doi.org/10.1007/s11783-013-0489-0

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  • DOI: https://doi.org/10.1007/s11783-013-0489-0

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