Improvement of Al2O3 on the multi-pollutant control performance of NOx and chlorobenzene in vanadia-based catalysts

Shixuan Yu; Xiaowei Niu; Zijian Song; Xu Huang; Yue Peng; Junhua Li

doi:10.1016/j.chemosphere.2021.133156

Improvement of Al₂O₃ on the multi-pollutant control performance of NO_x and chlorobenzene in vanadia-based catalysts

Chemosphere. 2022 Feb:289:133156. doi: 10.1016/j.chemosphere.2021.133156. Epub 2021 Dec 2.

Authors

Shixuan Yu¹, Xiaowei Niu², Zijian Song³, Xu Huang³, Yue Peng⁴, Junhua Li³

Affiliations

¹ State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, PR China; Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang, 110044, China.
² Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang, 110044, China. Electronic address: niuxiaowei@jlu.edu.cn.
³ State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, PR China.
⁴ State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, PR China. Electronic address: pengyue83@tsinghua.edu.cn.

PMID: 34864012
DOI: 10.1016/j.chemosphere.2021.133156

Abstract

We compared the influences of Al₂O₃ and SiO₂ on a traditional V₂O₅-MoO₃/TiO₂ for the simultaneous removal of NO_x and chlorobenzene (CB). The Al₂O₃ doping catalyst considerably broadens the active temperature window with higher NO_x reduction and CB oxidation efficiencies than the SiO₂ doping one and the V₂O₅-MoO₃/TiO₂. Furthermore, its resistance to SO₂ was preserved and the quantities of polychlorinated byproducts also decreased. The increase in activity at low temperatures could be due to the promotion of vanadia reducibility via interactions between V₂O₅ and Al₂O₃. Moreover, the high temperature activity could be due to the additional surface acidities provided by Al₂O₃, in which the Lewis acid sites played the predominant role in both NH₃ adsorptions and CB de-chlorination compared to the Brønsted acid sites. Finally, we proposed that Al₂O₃ is an effective addition for vanadia-based catalyst in NO_x and CB simultaneous removal from stationary sources.

Keywords: Al(2)O(3); Chlorobenzene; Multi-pollutants control; SCR; Vanadia.

MeSH terms

Catalysis
Chlorobenzenes
Environmental Pollutants*
Silicon Dioxide*
Titanium

Substances

Chlorobenzenes
Environmental Pollutants
Silicon Dioxide
Titanium