Temperature-programmed diffuse reflectance infrared Fourier transform spectroscopy (TPDRIFTS) has been used to characterize a reacted selective catalytic reduction (SCR) vanadia/titania catalyst. At room temperature the reacted catalyst presents ammonium ions adsorbed on the surface. On heating under N2 flow, a surface redox reaction takes place; ammonium ions are oxidized to bridged nitrosyls species, while V5+=O groups are reduced to V3+. Reduction of V5+ species to V3+ ions occurs at lower temperatures than those observed in conventional TPR processes under H2 atmospheres. At higher temperatures, bridged nitrosyls species become monoden-tate, first in an angular configuration and then in a linear one. Previous data on the SCR reaction let us propose that they are desorbed from the surface as gaseous N2O.

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