Editor Login|Register

Advanced Search

Submit Manuscript>>>

Recent Published Articles

Interface sites on vanadia-based catalysts are highly active for NOx removal under realistic conditions


Hong He , Zhihui Lv , Guangzhi He , Wenshuo Zhang , Jingjing Liu , Zhihua Lian , Yang Yang , Zidi Yan , Guangyan Xu , Wenpo Shan , Yunbo Yu

DOI:10.1016/j.jes.2022.10.007

Received September 14, 2022,Revised , Accepted October 07, 2022, Available online October 23, 2022

Volume 36,2024,Pages 523-536

PDF

Email Article

Add to My Reading List

Export Citation

TiO2-supported V2O5 catalysts are commonly used in NOx reduction with ammonia due to their robust catalytic performance. Over these catalysts, it is generally considered that the active species are mainly derived from the vanadia species rather than the intrinsic structure of V-O-Ti entities, namely the interface sites. To reveal the role of V-O-Ti entities in NH3-SCR, herein, we prepared TiO2/V2O5 catalysts and demonstrated that V-O-Ti entities were more active for NOx reduction under wet conditions than the V sites (V=O) working alone. On the V-O-Ti entities, kinetic measurements and first principles calculations revealed that NH3 activation exhibited a much lower energy barrier than that on V=O sites. Under wet conditions, the V-O-Ti interface significantly inhibited the transformation of V=O to V-OH sites thus benefiting NH3 activation. Under wet conditions, meanwhile, the migration of NH4+ from Ti site neighboring the V-O-Ti interface to Ti site of the V-O-Ti interface was exothermic; thus, V-O-Ti entities together with neighboring Ti sites could serve as channels linking NH3 pool and active centers for activation of NH4+. This finding reveals that the V-O-Ti interface sites on V-based catalysts play a crucial role in NOx removal under realistic conditions, providing a new perspective on NH3-SCR mechanism.
Browse JES

Article In Press

Current Issue

Special Issues

Archive

List of Issues

JES Ebook

About JES

About JES

Impact Factor

Editoral Board

Early Career Editorial Board

Subscribe

Contact

JES@ELSEVIER

JES@ScienceDirect

For Authors

Guide For Author

Figure Guidelines

Graphic Abstract Guidelines

Video Abstract Guidelines

Submit Your Paper

JES|Events
Stay Connected

Copyright © Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.京ICP备05002858号-3