Abstract
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.
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription