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The role of oxidation catalyst in dual-catalyst bed for after-treatment of lean burn natural gas exhaust

Paper ID Volume ID Publish Year Pages File Format Full-Text
55316 47047 2012 10 PDF Available
Title
The role of oxidation catalyst in dual-catalyst bed for after-treatment of lean burn natural gas exhaust
Abstract

A dual-catalyst bed composed of a reduction (Pd/SZ) and an oxidation (CoOx/CeO2) catalyst was investigated for selective catalytic reduction (SCR) of NO2 using hydrocarbons for lean-burn natural gas engines. The choice of a multifunctional oxidation catalyst was seen to play a crucial role to achieve the desirable NO2 reduction performance. A dual-catalyst bed optimization showed that different cobalt containing oxidation catalysts could be exploited to achieve desirable NOx and hydrocarbon conversions. Moreover, cyclic experiments in the presence of water vapor were conducted to understand its implications on dual catalyst bed performance. Finally, both kinetic and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) studies were undertaken to examine the behavior of the oxidation catalyst with respect to hydrocarbon oxidation which consequently affect the overall NOx reduction activity.

Graphical abstractA dual-catalyst bed composed of a reduction (Pd/SZ) and an oxidation (Co/CeO2) catalyst was investigated for selective catalytic reduction (SCR) of NOx using hydrocarbons for lean-burn natural gas engines.Figure optionsDownload full-size imageDownload high-quality image (166 K)Download as PowerPoint slideHighlights► A dual-bed catalyst is investigated for hydrocarbon-SCR for lean burn engines. ► Oxidation catalyst composition affects overall performance of dual-catalyst bed. ► Reduction-to-oxidation catalyst bed ratio is optimized to enhance SCR performance. ► Kinetics of hydrocarbon oxidation is reported. ► DRIFTS study helps elucidate the role of reduction and oxidation catalysts.

Keywords
NOx reduction; Sulfated zirconia; Palladium; Cobalt catalyst; Kinetics; DRIFTS; Effect of water; Lean gas engines
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The role of oxidation catalyst in dual-catalyst bed for after-treatment of lean burn natural gas exhaust
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 197, Issue 1, 15 December 2012, Pages 127–136
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