Issue 45, 2023

Active sites of NO selective catalytic reduction over V2O5–WO3/TiO2

Abstract

Selective catalytic reduction (SCR) is the most effective technology to control NO emission using commercial V2O5–WO3/TiO2 catalysts, but the nature of active catalytic sites remains under debate. Here we provide evidence demonstrating that dinuclear vanadium–tungsten sites are the most active catalytic sites of conventional V2O5–WO3/TiO2 catalysts, inconsistent with a prevailing view that dimeric vanadium sites are the active sites. The dinuclear vanadium–tungsten sites have inherently stronger acidity than the dimeric vanadium sites, favoring NH3 adsorption. Meanwhile, the vanadium 3d electrons of the dinuclear vanadium–tungsten sites are richer than those of the dimeric vanadium sites, facilitating O2 activation in SCR. Hence, the dinuclear vanadium–tungsten sites have higher SCR activity than the dimeric vanadium sites under identical reaction conditions. This work settles a long dispute on the identification of active sites of conventional V2O5–WO3/TiO2 SCR catalysts, thus having implications for a unified explanation of disparate SCR reaction mechanisms and rational design of improved SCR catalysts.

Graphical abstract: Active sites of NO selective catalytic reduction over V2O5–WO3/TiO2

Supplementary files

Article information

Article type
Paper
Submitted
11 Sep 2023
Accepted
25 Oct 2023
First published
26 Oct 2023

J. Mater. Chem. A, 2023,11, 24644-24650

Active sites of NO selective catalytic reduction over V2O5–WO3/TiO2

D. Xu, W. Qu, J. Liu, J. Chen, X. Fang, L. Chen, Z. Ma, X. Liu, X. Tang and Y. Chen, J. Mater. Chem. A, 2023, 11, 24644 DOI: 10.1039/D3TA05525F

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