Chemical deactivation of V2O5-WiO3/TiO2 SCR catalyst by combined effect of potassium and chloride

doi:10.1007/s11783-013-0489-0

Front Envir Sci Eng

2013, Vol. 7

Issue (3) : 420-427 https://doi.org/10.1007/s11783-013-0489-0

RESEARCH ARTICLE

Chemical deactivation of V₂O₅-WiO₃/TiO₂ SCR catalyst by combined effect of potassium and chloride

Xiaodong WU^1,2,3(

), Wenchao YU¹, Zhichun SI², Duan WENG^1,2

1. State Key Laboratory of New Ceramics & Fine Process, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; 2. Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; 3. Yangtze Delta Region Institute of Tsinghua University, Jiaxing 314000, China

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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 Br?nsted acidity of catalysts and decrease the stability of Br?nsted 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.

Keywords V₂O₅-WO₃/TiO₂ potassium chloride poisoning reducibility acid sites

Corresponding Author(s): WU Xiaodong,Email:wuxiaodong@tsinghua.edu.cn

Issue Date: 01 June 2013

Cite this article:

Xiaodong WU,Wenchao YU,Zhichun SI, et al. Chemical deactivation of V₂O₅-WiO₃/TiO₂ SCR catalyst by combined effect of potassium and chloride[J]. Front Envir Sci Eng, 2013, 7(3): 420-427.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0489-0
https://academic.hep.com.cn/fese/EN/Y2013/V7/I3/420

Fig.1 NH-SCR activities of the catalysts

Fig.2 The first-order rate constants for NO reduction

Fig.3 XRD patterns of (1) VWT, (2) VWT(NHCl), (3) VWT(KOH) and (4) VWT(KCl) catalysts

Tab.1 Structural and textural properties of the catalysts

Fig.4 Pore size distributions of the catalysts

Fig.5 Raman spectra of (1) VWT, (2) VWT(NHCl), (3) VWT(KOH) and (4) VWT(KCl) catalysts

Fig.6 UV-vis spectra of (1) VWT, (2) VWT(NHCl), (3) VWT(KOH) and (4) VWT(KCl) catalysts

Fig.7 FTIR spectra of (1) VWT, (2) VWT(NHCl), (3) VWT(KOH) and (4) VWT (KCl) catalysts arising from contact of NH at (a) room temperature and (b) 200°C

Fig.8 H-TPR curves of (1) fresh, (2) VWT(NHCl), (3) VWT(KOH) and (4) VWT(KCl) catalysts

Fig.9 NH oxidation curves of the catalysts

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