Polymerization State of Vanadyl Species Affects the Catalytic Activity and Arsenic Resistance of the V2O5–WO3/TiO2 Catalyst in Multipollutant Control of NOx and Chlorinated Aromatics

The conventional V2O5–WO3/TiO2 catalyst suffers severely from arsenic poisoning, leading to a significant loss of catalytic activity. The doping of Al or Mo plays an important role in promoting the arsenic resistance on NH3 selective catalytic reduction (NH3-SCR), but their promotion mechanism remai...

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Bibliographic Details
Published in:Environmental science & technology 2023-05, Vol.57 (19), p.7590-7598
Main Authors: Long, Yunpeng, Su, Yuetan, Chen, Meiling, Lu, Shuang, Luo, Xueqing, Zhu, Zhenghang, Wu, Zhongbiao, Weng, Xiaole
Format: Article
Language:English
Subjects:
Ammonia
Aromatic compounds
Arsenates
Arsenic
Catalysts
Catalytic activity
Chemical reduction
Density functional theory
Doping
Molybdenum
Polymerization
Selective catalytic reduction
Titanium dioxide
Tungsten oxides
Vanadium pentoxide
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Summary:The conventional V2O5–WO3/TiO2 catalyst suffers severely from arsenic poisoning, leading to a significant loss of catalytic activity. The doping of Al or Mo plays an important role in promoting the arsenic resistance on NH3 selective catalytic reduction (NH3-SCR), but their promotion mechanism remains in debate and has yet to be explored in multipollutant control (MPC) of NOx and chlorinated organics. Herein, our experimental characterizations and density functional theory (DFT) calculations confirmed that arsenic species preferentially adsorb on both Al and Mo to form arsenate, thereby avoiding bonding to the catalytically active V sites. More importantly, Al doping partially converted the polymeric vanadyl species into monomeric ones, thereby inhibiting the near-surface and bulk lattice oxygen mobility of the V2O5–WO3/TiO2 catalyst, while Mo doping resulted in vanadyl polymerization with an enriched V5+ chemical state and exhibited superior MPC activity and COx selectivity. Our work shows that antipoisoning catalysts can be designed with the combination of site protection and occurrence state modification of the active species.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.2c08959