Mechanism by which Tungsten Oxide Promotes the Activity of Supported V 2 O 5 /TiO 2 Catalysts for NO X Abatement: Structural Effects Revealed by 51 V MAS NMR Spectroscopy

Jaegers, Nicholas R.; Lai, Jun‐Kun; He, Yang; Walter, Eric; Dixon, David A.; Vasiliu, Monica; Chen, Ying; Wang, Chongmin; Hu, Mary Y.; Mueller, Karl T.; Wachs, Israel E.; Wang, Yong; Hu, Jian Zhi

doi:10.1002/ange.201904503

Title: Mechanism by which Tungsten Oxide Promotes the Activity of Supported V ₂ O ₅ /TiO ₂ Catalysts for NO _X Abatement: Structural Effects Revealed by ⁵¹ V MAS NMR Spectroscopy

Journal Article · Mon Sep 02 00:00:00 EDT 2019 · Angewandte Chemie

DOI:https://doi.org/10.1002/ange.201904503· OSTI ID:1547077

^[1]; Lai, Jun‐Kun ^[2]; He, Yang ^[3]; Walter, Eric ^[3]; Dixon, David A. ^[4]; Vasiliu, Monica ^[4]; Chen, Ying ^[3]; Wang, Chongmin ^[3]; Hu, Mary Y. ^[3]; Mueller, Karl T. ^[3]; Wachs, Israel E. ^[2]; Wang, Yong ^[1];

^[3]

Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA, Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman WA 99163 USA
OperandoMolecular Spectroscopy &, Catalysis Laboratory Lehigh University Bethlehem PA 18015 USA
Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
Department of Chemistry The University of Alabama Tuscaloosa AL 35487 USA

Abstract The selective catalytic reduction (SCR) of NO _x with NH ₃ to N ₂ with supported V ₂ O ₅ (‐WO ₃ )/TiO ₂ catalysts is an industrial technology used to mitigate toxic emissions. Long‐standing uncertainties in the molecular structures of surface vanadia are clarified, whereby progressive addition of vanadia to TiO ₂ forms oligomeric vanadia structures and reveals a proportional relationship of SCR reaction rate to [surface VO _x concentration] ² , implying a 2‐site mechanism. Unreactive surface tungsta (WO ₃ ) also promote the formation of oligomeric vanadia (V ₂ O ₅ ) sites, showing that promoter incorporation enhances the SCR reaction by a structural effect generating adjacent surface sites and not from electronic effects as previously proposed. The findings outline a method to assess structural effects of promoter incorporation on catalysts and reveal both the dual‐site requirement for the SCR reaction and the important structural promotional effect that tungsten oxide offers for the SCR reaction by V ₂ O ₅ /TiO ₂ catalysts.

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Sponsoring Organization:: USDOE

OSTI ID:: 1547077

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 131 Journal Issue: 36; ISSN 0044-8249

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Title: Mechanism by which Tungsten Oxide Promotes the Activity of Supported V ₂ O ₅ /TiO ₂ Catalysts for NO _X Abatement: Structural Effects Revealed by ⁵¹ V MAS NMR Spectroscopy