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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 Brønsted acid sites. The redox promoters increased the NO conversion, but SOx impregnation inhibited their effect due to acid (SOx)-base (CeOx/CuOx) interactions. Finally, 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.

Authors:
 [1];  [2];  [2];  [2]
+ Show Author Affiliations
  1. Lehigh Univ., Bethlehem, PA (United States); Tianjin Univ. (China)
  2. Lehigh Univ., Bethlehem, PA (United States)
Publication Date:
Research Org.:
Georgia Institute of Technology, Atlanta, GA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Understanding and Control of Acid Gas-induced Evolution of Materials for Energy (UNCAGE-ME)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1976837
Grant/Contract Number:  
SC0012577
Resource Type:
Accepted Manuscript
Journal Name:
Applied Catalysis. B, Environmental
Additional Journal Information:
Journal Volume: 306; Journal Issue: C; Journal ID: ISSN 0926-3373
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemistry; Engineering; SCR; catalysts; supported V205-W03/Ti02; promoters; redox; ceria; copper; spectroscopy; Raman; infrared; temperature-programmed surface reaction (TPSR)

Citation Formats

Guo, Mingyu, Mosevitzky Lis, Bar, Ford, Michael E., and Wachs, Israel E. 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. United States: N. p., 2022. Web. doi:10.1016/j.apcatb.2022.121108.
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Guo, Mingyu, Mosevitzky Lis, Bar, Ford, Michael E., & Wachs, Israel E. 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. United States. https://doi.org/10.1016/j.apcatb.2022.121108
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Guo, Mingyu, Mosevitzky Lis, Bar, Ford, Michael E., and Wachs, Israel E. Tue . "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". United States. https://doi.org/10.1016/j.apcatb.2022.121108. https://www.osti.gov/servlets/purl/1976837.
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@article{osti_1976837,
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},
author = {Guo, Mingyu and Mosevitzky Lis, Bar and Ford, Michael E. and Wachs, Israel E.},
abstractNote = {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. Finally, 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.},
doi = {10.1016/j.apcatb.2022.121108},
journal = {Applied Catalysis. B, Environmental},
number = C,
volume = 306,
place = {United States},
year = {Tue Jan 18 00:00:00 EST 2022},
month = {Tue Jan 18 00:00:00 EST 2022}
}
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https://doi.org/10.1016/j.apcatb.2022.121108
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