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

Research output: Contribution to journalArticlepeer-review

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. 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 languageEnglish
Article number121108
JournalApplied Catalysis B: Environmental
Volume306
DOIs
Publication statusPublished - 5 Jun 2022
Externally publishedYes

Keywords

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

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