Abstract
Abstract In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was used to investigate the effect of SO 2 on the selective catalytic reduction (SCR) of NO x by C 3 H 6 over an Ag/Al 2 O 3 catalyst. The DRIFTS spectra showed an obvious blue shift in the band of sulfate species when its coverage over Ag/Al 2 O 3 was increased. The sulfate species not only inhibited the formation of NO 3 − , but also suppressed the reaction of the enolic species or acetate species with NO 3 − to form –NCO species. These behaviors are responsible for the deactivation of Ag/Al 2 O 3 during the SCR of NO x by C 3 H 6 in the presence of SO 2 .
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