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Enhanced NOx reduction and byproduct removal by (HC + OHC)/SCR over multifunctional dual-bed monolith catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
55558 47057 2012 12 PDF Available
Title
Enhanced NOx reduction and byproduct removal by (HC + OHC)/SCR over multifunctional dual-bed monolith catalyst
Abstract

Selective catalytic reduction of NOx over Ag/Al2O3 monolith catalyst was investigated using a dodecane–ethanol mixture as the reductant, with special attention to the increased formation of harmful byproducts due to ethanol in the reductant hydrocarbon mixture. To compensate the tradeoff effect of ethanol by fully utilizing and/or efficiently removing these hazardous byproducts formed over the Ag/Al2O3 catalyst, additional catalysts were employed in a double-layer or dual-bed configuration, or a combination thereof. Among the catalysts tested, a trimetallic dual-bed monolith catalyst was identified as the best combination for the maximum NOx-to-N2 conversion (∼90% above 300 °C) with a minimum formation of harmful byproducts, through multifunctional cooperative catalytic processes on Ag/Al2O3, CuCoY and Pd/Al2O3. Reaction intermediates formed on catalyst surfaces were investigated using an in situ DRIFT for both single-bed and dual-bed catalysts, thereby identifying three important roles of Ag/Al2O3 in the front bed. The relative importance of various deNOx processes occurring on CuCoY in the rear bed strongly depends on the reaction temperature and the gas space velocity over the dual-bed catalyst system. Reaction pathways of (HC + OHC)/SCR in the dual-bed catalyst system were discussed in light of the maximum NOx conversion with a minimum consumption of OHC.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (209 K)Download as PowerPoint slideHighlights► Ethanol added to dodecane enhanced the deNOx activity of Ag/Al2O3 catalyst. ► It also increased the formation of harmful byproducts, NH3, HCN and aldehydes. ► To remove the byproducts, a double-layer or dual-bed catalytic system was developed. ► Ag/Al2O3 with CuCoY washcoated onto Pd/Al2O3 provided the best deNOx system.

Keywords
Ag/Al2O3; CuCoY; Pd/Al2O3; HC/SCR; OHC/SCR; Double-layer monolith catalyst
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Enhanced NOx reduction and byproduct removal by (HC + OHC)/SCR over multifunctional dual-bed monolith catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 184, Issue 1, 30 April 2012, Pages 95–106
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