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

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

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

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

Research output: Contribution to journal › Article › peer-review

Abstract

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. 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.

Original language	English
Article number	121128
Journal	Applied Catalysis B: Environmental
Volume	306
DOIs	https://doi.org/10.1016/j.apcatb.2022.121128
Publication status	Published - 5 Jun 2022
Externally published	Yes

Keywords

Catalysts, supported VO-WO/TiO
Promoters, non-redox, alumina, phosphorous, silica, zirconia
SCR
Spectroscopy, Raman, Infrared
Temperature-Programmed Surface Reaction (TPSR)

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.apcatb.2022.121128

Cite this

@article{e17870e61a4d4561afcfff165140bbc4,

title = "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",

abstract = "The SCR activity of MOx (M=Al, P, Si, Zr) promoted V2O5-WO3/TiO2 was investigated before and after sulfation. In situ IR spectroscopy indicated that the VOx 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 (AlOx and ZrOx) and Br{\o}nsted (POx, SiOx, VOx, WOx and SOx) acid site concentrations. The SiOx and ZrOx promoters had little effect on NO conversion, while the AlOx and POx promoters and surface sulfation generally inhibited it. The SiOx promoted catalyst was highly SCR active despite lacking Lewis acid sites, indicating that they are not vital for SCR. The N2O formation activity of the catalyst was inhibited by surface sulfation and the promoters, correlating with the promoter and SOx induced increase in the Br{\o}nsted acid sites{\textquoteright} strength.",

keywords = "Catalysts, supported VO-WO/TiO, Promoters, non-redox, alumina, phosphorous, silica, zirconia, SCR, Spectroscopy, Raman, Infrared, Temperature-Programmed Surface Reaction (TPSR)",

author = "Mingyu Guo and {Mosevitzky Lis}, Bar and Ford, {Michael E.} and Wachs, {Israel E.}",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2022",

month = jun,

day = "5",

doi = "10.1016/j.apcatb.2022.121128",

language = "English",

volume = "306",

journal = "Applied Catalysis B: Environmental",

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TY - JOUR

T1 - 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

AU - Guo, Mingyu

AU - Mosevitzky Lis, Bar

AU - Ford, Michael E.

AU - Wachs, Israel E.

PY - 2022/6/5

Y1 - 2022/6/5

N2 - The SCR activity of MOx (M=Al, P, Si, Zr) promoted V2O5-WO3/TiO2 was investigated before and after sulfation. In situ IR spectroscopy indicated that the VOx 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 (AlOx and ZrOx) and Brønsted (POx, SiOx, VOx, WOx and SOx) acid site concentrations. The SiOx and ZrOx promoters had little effect on NO conversion, while the AlOx and POx promoters and surface sulfation generally inhibited it. The SiOx promoted catalyst was highly SCR active despite lacking Lewis acid sites, indicating that they are not vital for SCR. The N2O formation activity of the catalyst was inhibited by surface sulfation and the promoters, correlating with the promoter and SOx induced increase in the Brønsted acid sites’ strength.

AB - The SCR activity of MOx (M=Al, P, Si, Zr) promoted V2O5-WO3/TiO2 was investigated before and after sulfation. In situ IR spectroscopy indicated that the VOx 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 (AlOx and ZrOx) and Brønsted (POx, SiOx, VOx, WOx and SOx) acid site concentrations. The SiOx and ZrOx promoters had little effect on NO conversion, while the AlOx and POx promoters and surface sulfation generally inhibited it. The SiOx promoted catalyst was highly SCR active despite lacking Lewis acid sites, indicating that they are not vital for SCR. The N2O formation activity of the catalyst was inhibited by surface sulfation and the promoters, correlating with the promoter and SOx induced increase in the Brønsted acid sites’ strength.

KW - Catalysts, supported VO-WO/TiO

KW - Promoters, non-redox, alumina, phosphorous, silica, zirconia

KW - SCR

KW - Spectroscopy, Raman, Infrared

KW - Temperature-Programmed Surface Reaction (TPSR)

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U2 - 10.1016/j.apcatb.2022.121128

DO - 10.1016/j.apcatb.2022.121128

M3 - Article

AN - SCOPUS:85123427655

SN - 0926-3373

VL - 306

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

M1 - 121128

ER -

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

Abstract

Keywords

UN SDGs

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Other files and links

Fingerprint

Plasma-assisted manipulation of vanadia nanoclusters for efficient selective catalytic reduction of NOx

Effect of redox promoters (CeO_x and CuO_x) and surface sulfates on the selective catalytic reduction (SCR) of NO with NH₃ by supported V₂O₅-WO₃/TiO₂ catalysts

Structure-Activity Relationships of Hydrothermally Aged Titania-Supported Vanadium-Tungsten Oxide Catalysts for SCR of NO_xEmissions with NH₃

Structure-Performance Relationships for Non-redox Promoted (AlOx, POx, SiOx and ZrOx) and Surface Sulfated V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction (SCR) of NO with NH3

Cite this

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

Abstract

Keywords

UN SDGs

Access to Document

Other files and links

Fingerprint

Research output

Plasma-assisted manipulation of vanadia nanoclusters for efficient selective catalytic reduction of NOx

Effect of redox promoters (CeOx and CuOx) and surface sulfates on the selective catalytic reduction (SCR) of NO with NH3 by supported V2O5-WO3/TiO2 catalysts

Structure-Activity Relationships of Hydrothermally Aged Titania-Supported Vanadium-Tungsten Oxide Catalysts for SCR of NOxEmissions with NH3

Activities

Structure-Performance Relationships for Non-redox Promoted (AlOx, POx, SiOx and ZrOx) and Surface Sulfated V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction (SCR) of NO with NH3

Cite this

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

Effect of redox promoters (CeO_x and CuO_x) and surface sulfates on the selective catalytic reduction (SCR) of NO with NH₃ by supported V₂O₅-WO₃/TiO₂ catalysts

Structure-Activity Relationships of Hydrothermally Aged Titania-Supported Vanadium-Tungsten Oxide Catalysts for SCR of NO_xEmissions with NH₃