Citation: WANG Jun-jie, ZHANG Ya-ping, WANG Wen-xuan, XIAO Rui, LI Juan, GUO Wan-qiu. Mechanism of CaSO₄ poisoning commercial V₂O₅-WO₃/TiO₂ catalyst for flue gas selective catalytic reduction of NO_x with NH₃[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(7): 888-896. shu

Mechanism of CaSO₄ poisoning commercial V₂O₅-WO₃/TiO₂ catalyst for flue gas selective catalytic reduction of NO_x with NH₃

1.
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
2.
Jiangsu Wande Environmental Protection Technology CO., Ltd, Yangzhou 225131, China

Corresponding author: ZHANG Ya-ping, amflora@seu.edu.cn
Received Date: 7 December 2015
Revised Date: 29 February 2016

Fund Project: the Natural Science Foundation of Jiangsu Province BK2012347The project was supported by the National Natural Science Foundation of China 51306034Key Research Program of Jiangsu Province BE2015677

Figures(7)

Based on commercial V₂O₅-WO₃/TiO₂ catalyst, two methods to simulate CaSO₄ poisoning were designed, and the physico-chemical properties of fresh and poisoned catalysts were investigated by BET specific surface area measurement, X-ray diffraction (XRD), H₂ temperature-programmed reduction (H₂-TPR), scanning electron microscope (SEM) and in-situ diffuse reflectance infrared spectrometry (in situ DRIFTS). Meanwhile, the catalytic performance for selective catalytic reduction of NO with NH₃(NH₃-SCR) in a fixed bed was also explored comparatively. SEM results show that CaSO₄ plugs the small hole (pore width smaller than 2.7 nm) and big hole (pore width bigger than 17.8 nm), causing the loss of surface area and pore volume. CaSO₄ could weaken the intensity of both Br∅nsted acid Sites and Lewis acid sites, particularly the active centers of Br∅nsted acid sites, which hinders the absorption of NH₃ and reduces the redox abilities.
- mechanism,
- CaSO₄ poisoning,
- V₂O₅-WO₃/TiO₂,
- selective catalytic reduction (SCR)
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Mechanism of CaSO4 poisoning commercial V2O5-WO3/TiO2 catalyst for flue gas selective catalytic reduction of NOx with NH3

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通讯作者: 陈斌, bchen63@163.com

Mechanism of CaSO₄ poisoning commercial V₂O₅-WO₃/TiO₂ catalyst for flue gas selective catalytic reduction of NO_x with NH₃