fulltext.study @t Gmail

The influence of chemical and thermal aging on the catalytic activity of a monolithic diesel oxidation catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
47362 46469 2009 8 PDF Available
Title
The influence of chemical and thermal aging on the catalytic activity of a monolithic diesel oxidation catalyst
Abstract

Chemical and thermal aging effects and their influence on the catalytic activity were analyzed for a commercial engine aged diesel oxidation catalyst (DOC). Samples were taken from the inlet (DOCin), the middle (DOCmid) and the outlet (DOCout) area of the ceramic monolith and were compared with a new (DOCnew) and thermal aged (DOC800 °C) diesel oxidation catalyst. In all aged DOCs the platinum particles were sintered with particle diameters typically ranging between 10 and 20 nm. DOCmid, DOCout and DOC800 °C exhibited platinum particle morphology with edges and facets. Round platinum particles without discernable edges and facets were detected in the case of DOCin. DOCin showed two types of continuous, μm-thick contaminant deposits (up to 5 and 20 μm) with differing elemental compositions covering the washcoat. Catalytic activity towards the abatement of CO, propene and NO did not show any substantial difference between the different engine aged DOC samples. Thermal aging seems to be the primary cause for the observed loss in catalytic activity compared to DOCnew. However, NO2 production above 275 °C was increasing along the monolith in the order of DOCin < DOCmid < DOCout revealing a possible influence of the type of aging on activity towards NO oxidation.

Keywords
Diesel oxidation catalyst; Aging; Activity; NO oxidation; Sintering; Poisoning; Particle morphology; CO adsorption; TEM; DRIFTS
First Page Preview
The influence of chemical and thermal aging on the catalytic activity of a monolithic diesel oxidation catalyst
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 93, Issues 1–2, 25 November 2009, Pages 177–184
Authors
, , ,
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