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Catalytic activity and aging phenomena of three-way catalysts in a compressed natural gas/gasoline powered passenger car

Paper ID Volume ID Publish Year Pages File Format Full-Text
47907 46485 2008 8 PDF Available
Title
Catalytic activity and aging phenomena of three-way catalysts in a compressed natural gas/gasoline powered passenger car
Abstract

The catalytic activity of the pre(p)- and the underfloor(u) three-way catalysts (TWCs), of a bifuel passenger car (compressed natural gas (CNG), gasoline), has been examined at a series of mileage milestones. Over a rather short lifetime of 35,000 km, a significant increase of the unburned total hydrocarbons (THC) has been determined during CNG operation. No comparable THC increase in the exhaust was found during gasoline operation. The THC increase was detected at exhaust temperatures well over 633 K, excluding methane specific light-off deterioration. Possible explanations for this fuel selective behaviour could be identified by the application of different surface techniques. XPS analysis hints to the formation of a metallic Pd layer formed over the catalytically active PdO core, probably having the highest impact on the decreased methane oxidation during CNG operation. Typical lubricating oil based contaminants like P, Ca, and Mg, have been detected on the catalysts’ surface as well.

Keywords
BET, Brunauer, Emmett, Teller; CADC, Common Artemis Driving Cycle; CLD, Chemical Luminescence Detector; CNG, Compressed Natural Gas; ECE, Economic Commission for Europe (driving cycle); EUDC, Extra Urban Driving Cycle; FID, Flame Ionisation Detector; GC,
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Catalytic activity and aging phenomena of three-way catalysts in a compressed natural gas/gasoline powered passenger car
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 1–2, 25 October 2008, Pages 162–169
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