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Effects of sulfate species on V2O5/TiO2 SCR catalysts in coal and biomass-fired systems

Paper ID Volume ID Publish Year Pages File Format Full-Text
47511 46474 2009 11 PDF Available
Title
Effects of sulfate species on V2O5/TiO2 SCR catalysts in coal and biomass-fired systems
Abstract

Sulfation occurs when commercial vanadia SCR catalysts are exposed to SO2-laden coal combustion flue gases. Effects of sulfation on the surface chemistry of vanadia/titania catalysts and SCR activity have not been adequately addressed in previously published work. In this work, in situ FTIR spectroscopy and post situ XPS investigations were performed during vanadia/titania catalyst sulfation under simulated coal combustion flue gas conditions. In situ FTIR spectroscopy combined with XPS analyses on fresh and sulfated TiO2, 2% and 5% V2O5/TiO2 indicate that sulfate does not form on vanadia sites but rather on titania sites. FTIR spectroscopy data show that sulfation inhibits NO adsorption in the presence of oxygen, but greatly enhances NH3 adsorption by generating additional Brønsted acid sites while reducing the concentration of Lewis acid sites. Observed increases in the intrinsic NO reduction activity of sulfated vanadia/titania catalysts (relative to fresh catalysts) are consistent with spectroscopy data showing that the sulfation enhances NO reduction activity by increasing the number of active sites without changing the activation energy or site acid strength.

Keywords
SCR catalyst; In situ FTIR; MS; XPS; Activity; Intrinsic kinetics
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Effects of sulfate species on V2O5/TiO2 SCR catalysts in coal and biomass-fired systems
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 92, Issues 1–2, 19 October 2009, Pages 30–40
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