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Ethanol-selective catalytic reduction of NO by Ag/Al2O3 catalysts: Activity and deactivation by alkali salts

Paper ID Volume ID Publish Year Pages File Format Full-Text
46292 46436 2012 7 PDF Available
Title
Ethanol-selective catalytic reduction of NO by Ag/Al2O3 catalysts: Activity and deactivation by alkali salts
Abstract

Ag/Al2O3 catalysts with and without potassium doping were prepared by incipient wetness impregnation and characterized by N2 physisorption, XRPD, NH3-TPD and SEM. The influence of the Ag content from 1 to 5 wt.% was investigated for the selective catalytic reduction (SCR) of NO with ethanol. The 3 wt.% Ag/Al2O3 catalyst was found to be the most active and CO2 selective over a wide temperature window (300–500 °C). Addition of 500 ppm of H2 has a mild promotional effect on the activity while SO2 has a strong negative influence on the SCR activity. Furthermore, the Ag/Al2O3 ethanol-SCR catalyst deactivated significantly by the addition of potassium although it was more resistant than the conventional V2O5 based NH3-SCR catalyst, which deactivated more at lower potassium loading. The higher potassium resistivity of the Ag/Al2O3 catalysts seems to be due to differences in reaction mechanism of Ag/Al2O3 ethanol-SCR catalyst compared to the conventional NH3-SCR catalyst. The still low potassium resistance, in combination with the high sensitivity to SO2, seems not to make these catalysts a real option for biomass fired boilers.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Ag/Al2O3 catalysts are highly active in hydrocarbon SCR and CO2 selective. ► Ag catalysts exhibited higher resistance to alkali salts than commercial V-based catalysts. ► 500 ppm of H2 promotes slightly and 25 ppm of SO2 severely deactivates the SCR activity.

Keywords
SCR of NO with ethanol; Ag/Al2O3; Potassium poisoning
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 127, 30 October 2012, Pages 323–329
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