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Soot and hydrocarbon oxidation over vanadia-based SCR catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
53621 46977 2015 9 PDF Available
Title
Soot and hydrocarbon oxidation over vanadia-based SCR catalysts
Abstract

•Propylene and soot are oxidized over V-based SCR catalysts.•The preparation method has a significant impact on SCR of NOx with NH3, propylene and soot oxidation.•CO was detected as major product during C3H6 oxidation whereas catalytic soot oxidation led predominantly to CO2 formation.•Strong inhibition on the standard and fast SCR process was especially observed in the temperature range where C3H6 oxidation occurs.

The selective catalytic reduction (SCR) of NOx with NH3 and the oxidation of propylene and soot have been investigated on a series of V-W-TiO2 SCR catalysts prepared by incipient wetness impregnation, flame spray pyrolysis and a commercial reference sample. Depending on the preparation method, monomeric vanadly, polymeric vanadia and also two-dimensional vanadyl structures with vanadium in the +5 oxidation state on the catalyst surface were identified using Raman and X-ray photoelectron spectroscopy. The amount of acidic sites was highest if SiO2 was added to the catalyst. The SCR-performance of the catalysts prepared by incipient wetness impregnation was similar to those reported in literature and to that shown by the commercial catalyst. The catalysts were also very attractive for propylene and soot oxidation. The synthesis method had a strong effect on the SCR of NOx and on both the propylene and soot oxidation activity. In all cases, CO and CO2 were detected as oxidation products from propylene. Catalytic soot oxidation led predominantly to CO2 formation. The presence of propylene has a strong impact on the SCR activity particularly in the temperature range where C3H6 oxidation occurs.

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Keywords
SCR; Propylene oxidation; Soot; Vanadia-titania
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Soot and hydrocarbon oxidation over vanadia-based SCR catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 258, Part 2, 1 December 2015, Pages 461–469
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us