Study of SO2 Effect on the Selective Catalytic Reduction of NOx with Propene over Ag/Al2O3 by in Situ DRIFTS

Abstract

Abstract: In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was used to investigate the effect of SO2 on the selective catalytic reduction (SCR) of NOx by C3H6 over an Ag/Al2O3 catalyst. The DRIFTS spectra showed an obvious blue shift in the band of sulfate species when its coverage over Ag/Al2O3 was increased. The sulfate species not only inhibited the formation of NO-3, but also suppressed the reaction of enolic species or acetate species with NO-3 to form -[KG-20x]NCO species. These behaviors are responsible for the deactivation of Ag/Al2O3 during the SCR of NOx by C3H6 in the presence of SO2.

Key words: silver, alumina, nitrogen oxide, sulfur dioxide, propene, selective catalytic reduction, in situ diffuse reflectance infrared Fourier transform spectroscopy, sulfate species

WU Qiang, GAO Hongwei, HE Hong*. Study of SO2 Effect on the Selective Catalytic Reduction of NOx with Propene over Ag/Al2O3 by in Situ DRIFTS[J]. Chinese Journal of Catalysis, 2006, 27(5): 403-408.

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Study of SO2 Effect on the Selective Catalytic Reduction of NOx with Propene over Ag/Al2O3 by in Situ DRIFTS

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