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Deactivation mechanisms of Pt/Pd-based diesel oxidation catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
55569 47057 2012 8 PDF Available
Title
Deactivation mechanisms of Pt/Pd-based diesel oxidation catalysts
Abstract

Currently precious metal-based diesel oxidation catalysts (DOC) containing platinum (Pt) and palladium (Pd) are most commonly used for the oxidation of hydrocarbon and NO in diesel exhaust hydrocarbon oxidation. The present work has been carried out to investigate the deactivation mechanisms of the DOC from its real-world vehicle operation by coupling its catalytic activity measurements with surface characterization including X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. A production Pt–Pd DOC was obtained after being aged on a vehicle driven for 135,000 miles in order to study its deactivation behavior. The performance of the vehicle-aged part was correlated with that of the simulated hydrothermal lab aged sample assuming that Pt–Pd sintering plays a major role in irreversible catalyst deactivation. In addition to the hydrothermal sintering, the deterioration of hydrocarbon and NO oxidation performance was caused by surface poisoning. The role of the various aging factors in determining long-term performance in mobile applications will be discussed.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (131 K)Download as PowerPoint slideHighlights► The NO oxidation activity was directly linked to the size and surface composition of Pt–Pd alloy particles. ► Unlike the case for NO oxidation, the dependence of particle growth on the C3H6 oxidation performance was relatively weak. ► C3H6 light-off behavior was largely affected by the accumulation of sulfur compounds.

Keywords
Diesel oxidation catalyst; Vehicle aging; Pt–Pd; Chemical poisoning; Deactivation; Soot
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 184, Issue 1, 30 April 2012, Pages 197–204
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