Modification of the V2O5-WO3/TiO2 catalyst with Nb to reduce its activity for SO2 oxidation during the selective catalytic reduction of NOx

WANG Bo; BIAN Yao; FENG Shuo; WANG Shao-qi; SHEN Bo-xiong

doi:10.1016/S1872-5813(21)60177-9

Volume 50 Issue 4

Apr. 2022

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WANG Bo, BIAN Yao, FENG Shuo, WANG Shao-qi, SHEN Bo-xiong. Modification of the V2O5-WO3/TiO2 catalyst with Nb to reduce its activity for SO2 oxidation during the selective catalytic reduction of NOx[J]. Journal of Fuel Chemistry and Technology, 2022, 50(4): 503-512. doi: 10.1016/S1872-5813(21)60177-9

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WANG Bo, BIAN Yao, FENG Shuo, WANG Shao-qi, SHEN Bo-xiong. Modification of the V₂O₅-WO₃/TiO₂ catalyst with Nb to reduce its activity for SO₂ oxidation during the selective catalytic reduction of NO_x[J]. Journal of Fuel Chemistry and Technology, 2022, 50(4): 503-512. doi: 10.1016/S1872-5813(21)60177-9

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Modification of the V₂O₅-WO₃/TiO₂ catalyst with Nb to reduce its activity for SO₂ oxidation during the selective catalytic reduction of NO_x

doi: 10.1016/S1872-5813(21)60177-9

WANG Bo^1
,,
BIAN Yao¹,
FENG Shuo¹,
WANG Shao-qi¹,
SHEN Bo-xiong^{1, 2
,
,}

1.
College of Energy and Environmental Engineering, Hebei University of Technology, Key Laboratory of Clean Energy Utilization and Pollutant Control in Tianjin, Tianjin 300401, China
2.
College of chemical engineering, Hebei University of Technology, Tianjin 300401, China

Funds: The project was supported by Joint Funds of the National Natural Science Foundation of China (U20A20302), Key R & D Projects in Tianjin (19ZXSZSN00050, 19ZXSZSN00070), Key R & D projects in Hebei Province (20373701D), and Project of Great Transformation of Scientific and Technical Research in Hebei Province (21283701Z).

Received Date: 2021-09-16
Accepted Date: 2021-10-20
Rev Recd Date: 2021-10-20

Available Online: 2021-11-15

Publish Date: 2022-04-26

Abstract

Abstract

A series of Nb-modified V₂O₅-WO₃/TiO₂ catalysts were prepared by the impregnation method and the effect of Nb loading on their SO₂ oxidation activity during the selective catalytic reduction of NO_x was investigated. The results indicate that the Nb₂O₅-V₂O₅-WO₃/TiO₂ catalyst with a Nb₂O₅ loading of 2% exhibits the lowest SO₂ conversion of 0.6% for oxidation at 350 °C, whereas the conversion of NO_x is still above 95%. The catalysts were characterized by TGA, BET, XRD, H₂-TPR, CO₂-TPD, XPS and in-situ DRIFTS. The results illustrate that the influence of Nb modification on the crystal structure of V₂O₅-WO₃/TiO₂ catalyst is rather insignificant; however, the surface area of the Nb₂O₅-V₂O₅-WO₃/TiO₂ catalyst decreases slightly after the modification with Nb, conducing to a decrease of SO₂ adsorption on the catalyst. Meanwhile, the content of oxygen adsorbed on the catalyst surface decreases considerably upon the Nb modification, suggesting a weakened redox performance, which is beneficial to reducing the oxidation of SO₂. The in-situ DRIFTS results illustrate that the content of the intermediate VOSO₄ product on the catalyst surface decreases over the Nb-modified Nb₂O₅-V₂O₅-WO₃/TiO₂ catalyst, leading to a decrease of SO₃ production.
- SO₂ oxidation,
- Nb modification,
- V₂O₅-WO₃/TiO₂,
- removal of NO_x by NH₃-SCR

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References(40)

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