Operando Raman/IR spectroscopy was applied to determine the active sites and surface reaction intermediates during SCR of NO with NH3 by supported VOx/TiO2 catalysts. Although both surface V+5 and V+4 sites are present during SCR, the surface V+5 sites predominate and are the catalytic active sites fro SCR because of the rapid oxidation of the surface VOx sites by gas phase molecular O2. Both surface NH3 species on Lewis acid sites and surface NH4+ species on Bronsted acid sites are present during SCR of NO with NH3 by supported VOx/TiO2 catalysts. The surface NH4+ species, however, are the most abundant reaction intermediates that control the SCR raection because the presence of moisture transforms the surface NH3 species to surface NH4+ species during SCR. Additional insights about the SCR reaction pathways were provided from isotopic labeling studies.

Operando vibrational spectroscopy during selective catalytic reduction of NO with NH3 by VOx/TiO2 catalysts

256th National Meeting (2018)

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