The effect of non-redox promoters (AlOx, POx, SiOx and ZrOx) and surface sulfates on supported V2O5-WO3/TiO2 catalysts in selective catalytic reduction of NO with NH3

Guo, Mingyu; Mosevitzky Lis, Bar; Ford, Michael E.; Wachs, Israel E.

doi:10.1016/j.apcatb.2022.121128

The effect of non-redox promoters (AlO_x, PO_x, SiO_x and ZrO_x) and surface sulfates on supported V₂O₅-WO₃/TiO₂ catalysts in selective catalytic reduction of NO with NH₃

Journal Article · Sat Jan 22 00:00:00 EST 2022 · Applied Catalysis. B, Environmental

DOI:https://doi.org/10.1016/j.apcatb.2022.121128· OSTI ID:1976839

Guo, Mingyu ^[1]; Mosevitzky Lis, Bar ^[2]; Ford, Michael E. ^[2]; Wachs, Israel E. ^[2]

Lehigh Univ., Bethlehem, PA (United States); Tianjin Univ. (China); Tianjin Univ. (China); OSTI
Lehigh Univ., Bethlehem, PA (United States)

The SCR activity of MO_x (M=Al, P, Si, Zr) promoted V₂O₅-WO₃/TiO₂ was investigated before and after sulfation. In situ IR spectroscopy indicated that the VO_x active sites preferentially anchor on promoter generated surface hydroxyl. In situ Raman spectroscopy confirmed that all oxides are completely dispersed on the TiO₂ surface. In situ NH₃-IR spectroscopy showed that the oxides can increase the Lewis (AlO_x and ZrO_x) and Brønsted (PO_x, SiO_x, VO_x, WO_x and SO_x) acid site concentrations. The SiO_x and ZrO_x promoters had little effect on NO conversion, while the AlO_x and PO_x promoters and surface sulfation generally inhibited it. The SiO_x promoted catalyst was highly SCR active despite lacking Lewis acid sites, indicating that they are not vital for SCR. Finally, the N₂O formation activity of the catalyst was inhibited by surface sulfation and the promoters, correlating with the promoter and SO_x induced increase in the Brønsted acid sites’ strength.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Understanding and Control of Acid Gas-induced Evolution of Materials for Energy (UNCAGE-ME); Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012577

OSTI ID:: 1976839

Journal Information:: Applied Catalysis. B, Environmental, Journal Name: Applied Catalysis. B, Environmental Journal Issue: C Vol. 306; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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The effect of non-redox promoters (AlOx, POx, SiOx and ZrOx) and surface sulfates on supported V2O5-WO3/TiO2 catalysts in selective catalytic reduction of NO with NH3

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The effect of non-redox promoters (AlO_x, PO_x, SiO_x and ZrO_x) and surface sulfates on supported V₂O₅-WO₃/TiO₂ catalysts in selective catalytic reduction of NO with NH₃