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

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

doi:10.1016/j.apcatb.2022.121108

Title: 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

Journal Article · Tue Jan 18 00:00:00 EST 2022 · Applied Catalysis. B, Environmental

DOI:https://doi.org/10.1016/j.apcatb.2022.121108· OSTI ID:1976837

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

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

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. 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.

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

Grant/Contract Number:: SC0012577

OSTI ID:: 1976837

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

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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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

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Title: 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