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

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

doi:10.1016/j.apcatb.2022.121108

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

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

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

Abstract

A series of TiO₂-supported MO_x catalysts (M=V, W, Ce, Cu and S) were investigated for their SCR activity. In situ Raman spectroscopy indicated that the supported MO_x phases were completely dispersed as surface sites on the TiO₂ support. In situ IR revealed that surface VO_x, WO_x and SO_x sites anchored at both CeO_x/CuO_x and TiO₂ sites. The number of surface Lewis acid sites decreased with the addition of basic (CeO_x/CuO_x) and acidic (VO_x/WO_x) sites in all catalysts, and acidic SO_x in the unpromoted and Ce-promoted catalysts. The surface VO_x, WO_x and SO_x sites introduced surface Brønsted acid sites. The redox promoters increased the NO conversion, but SO_x impregnation inhibited their effect due to acid (SO_x)-base (CeO_x/CuO_x) interactions. The SCR reaction was shown to efficiently proceed via either surface NH₃* or NH₄⁺* species, resolving the long-standing dispute on the involvement of these species in the SCR reaction.

Original language	English
Article number	121108
Journal	Applied Catalysis B: Environmental
Volume	306
DOIs	https://doi.org/10.1016/j.apcatb.2022.121108
Publication status	Published - 5 Jun 2022
Externally published	Yes

UN SDGs

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

SDG 3 Good Health and Well-being

Keywords

Catalysts
Ceria
Copper
Infrared
Promoters
Raman
Redox
SCR
Spectroscopy
Supported VO-WO/TiO
Temperature-programmed surface reaction (TPSR)

Access to Document

10.1016/j.apcatb.2022.121108

Cite this

@article{12a60d53ddef424b9ac5c654399148e4,

title = "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",

abstract = "A series of TiO2-supported MOx catalysts (M=V, W, Ce, Cu and S) were investigated for their SCR activity. In situ Raman spectroscopy indicated that the supported MOx phases were completely dispersed as surface sites on the TiO2 support. In situ IR revealed that surface VOx, WOx and SOx sites anchored at both CeOx/CuOx and TiO2 sites. The number of surface Lewis acid sites decreased with the addition of basic (CeOx/CuOx) and acidic (VOx/WOx) sites in all catalysts, and acidic SOx in the unpromoted and Ce-promoted catalysts. The surface VOx, WOx and SOx sites introduced surface Br{\o}nsted acid sites. The redox promoters increased the NO conversion, but SOx impregnation inhibited their effect due to acid (SOx)-base (CeOx/CuOx) interactions. The SCR reaction was shown to efficiently proceed via either surface NH3* or NH4+* species, resolving the long-standing dispute on the involvement of these species in the SCR reaction.",

keywords = "Catalysts, Ceria, Copper, Infrared, Promoters, Raman, Redox, SCR, Spectroscopy, Supported VO-WO/TiO, 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.2022.121108",

language = "English",

volume = "306",

journal = "Applied Catalysis B: Environmental",

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TY - JOUR

T1 - 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

AU - Guo, Mingyu

AU - Mosevitzky Lis, Bar

AU - Ford, Michael E.

AU - Wachs, Israel E.

PY - 2022/6/5

Y1 - 2022/6/5

N2 - A series of TiO2-supported MOx catalysts (M=V, W, Ce, Cu and S) were investigated for their SCR activity. In situ Raman spectroscopy indicated that the supported MOx phases were completely dispersed as surface sites on the TiO2 support. In situ IR revealed that surface VOx, WOx and SOx sites anchored at both CeOx/CuOx and TiO2 sites. The number of surface Lewis acid sites decreased with the addition of basic (CeOx/CuOx) and acidic (VOx/WOx) sites in all catalysts, and acidic SOx in the unpromoted and Ce-promoted catalysts. The surface VOx, WOx and SOx sites introduced surface Brønsted acid sites. The redox promoters increased the NO conversion, but SOx impregnation inhibited their effect due to acid (SOx)-base (CeOx/CuOx) interactions. The SCR reaction was shown to efficiently proceed via either surface NH3* or NH4+* species, resolving the long-standing dispute on the involvement of these species in the SCR reaction.

AB - A series of TiO2-supported MOx catalysts (M=V, W, Ce, Cu and S) were investigated for their SCR activity. In situ Raman spectroscopy indicated that the supported MOx phases were completely dispersed as surface sites on the TiO2 support. In situ IR revealed that surface VOx, WOx and SOx sites anchored at both CeOx/CuOx and TiO2 sites. The number of surface Lewis acid sites decreased with the addition of basic (CeOx/CuOx) and acidic (VOx/WOx) sites in all catalysts, and acidic SOx in the unpromoted and Ce-promoted catalysts. The surface VOx, WOx and SOx sites introduced surface Brønsted acid sites. The redox promoters increased the NO conversion, but SOx impregnation inhibited their effect due to acid (SOx)-base (CeOx/CuOx) interactions. The SCR reaction was shown to efficiently proceed via either surface NH3* or NH4+* species, resolving the long-standing dispute on the involvement of these species in the SCR reaction.

KW - Catalysts

KW - Ceria

KW - Copper

KW - Infrared

KW - Promoters

KW - Raman

KW - Redox

KW - SCR

KW - Spectroscopy

KW - Supported VO-WO/TiO

KW - Temperature-programmed surface reaction (TPSR)

UR - https://www.scopus.com/pages/publications/85123063663

U2 - 10.1016/j.apcatb.2022.121108

DO - 10.1016/j.apcatb.2022.121108

M3 - Article

AN - SCOPUS:85123063663

SN - 0926-3373

VL - 306

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

M1 - 121108

ER -

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

Abstract

UN SDGs

Keywords

Access to Document

Other files and links

Fingerprint

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

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

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

Poster presentation: Structure-Performance Relationships for Redox Promoted (CeOx and CuOx) and Surface Sulfated V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction (SCR) of NO with NH3

Structure-Performance Relationships for Redox Promoted (CeOx and CuOx) and Surface Sulfated V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction (SCR) of NO with NH3

Cite this

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

Abstract

UN SDGs

Keywords

Access to Document

Other files and links

Fingerprint

Research output

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

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

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

Activities

Poster presentation: Structure-Performance Relationships for Redox Promoted (CeOx and CuOx) and Surface Sulfated V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction (SCR) of NO with NH3

Structure-Performance Relationships for Redox Promoted (CeOx and CuOx) and Surface Sulfated V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction (SCR) of NO with NH3

Cite this

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

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

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