Citation: YANG Jian, LIN Fan, CHEN Kui, KONG Ming, ZHAO Dong, MENG Fei. Activity and SO₂ deactivation mechanism of vanadium series catalyst containing cerium[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(11): 1394-1400. shu

Activity and SO₂ deactivation mechanism of vanadium series catalyst containing cerium

Engineering Research Center for Energy and Environment of Chongqing, College of Materials Science and Engineering of Chongqing University, Chongqing 400044, China

Corresponding author: YANG Jian, skyinjune@cqu.edu.cn
Received Date: 13 June 2016
Revised Date: 17 July 2016

Fund Project: the National Natural Science Foundation of China 51204220National Natural Science Foundation of Chongqing cstc2013jjB0035the National Natural Science Foundation of China 51274263

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The promotion effect of Ce modification on V₂O₅-WO₃/TiO₂ for the selective catalytic reduction (SCR) of NO_x with NH₃ and the SO₂ deactivation mechanism were investigated. Compared with V₁W₅Ti catalyst, the advantage of V₁W₅Ce₆Ti catalyst shows a good catalytic activity. These catalysts were investigated by means of XRD, BET, FT-IR, TG-DSC and XPS. The results demonstrate that the active components of V and W are well-dispersed, while a small cluster of cubic CeO₂ appears over the V₁W₅Ce₈Ti catalyst. The sulfation of V₁W₅Ti under reactive conditions can generate NH₄HSO₄ and (NH₄)₂SO₄ at 250℃. The Ce additive to V₁W₅Ti could provide stronger Brønsted acid sites and more chemisorbed oxygen. The deposited ammonium sulfate on V₁W₅Ce₆Ti catalyst is much smaller than that on V₁W₅Ti because the cerium sulfates species on the surface of V₁W₅Ce₆Ti is formed and the deposition of ammonium sulfate is inhibited, which can disrupt the redox cycle between Ce³⁺ and Ce⁴⁺ and break the V-O-Ce structure, causing the deactivation of V₁W₅Ce₆Ti catalyst.
- selective catalytic reduction,
- V₂O₅-WO₃/TiO₂,
- cerium doped,
- SO₂ deactivation
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Activity and SO2 deactivation mechanism of vanadium series catalyst containing cerium

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通讯作者: 陈斌, bchen63@163.com

Activity and SO₂ deactivation mechanism of vanadium series catalyst containing cerium