fulltext.study @t Gmail

Characterization and reactivity of Ce-promoted PtBa lean NOx trap catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
55322 47047 2012 12 PDF Available
Title
Characterization and reactivity of Ce-promoted PtBa lean NOx trap catalysts
Abstract

The effect of cerium addition to a model Pt-Ba/Al2O3 lean NOx trap catalyst (LNT) is investigated in this paper by a combination of characterization techniques and reactivity experiments. It is found that the presence of Ce does not alter the morphological and structural characteristics of the catalyst, although slight changes in the Ba-carbonate phase are apparent. On the other hand, the presence of Ce does not seem to affect significantly the characteristics of Pt, in particular its redox state. CO adsorption experiments pointed out the presence of Pt° particles presenting different coordination degree, whose characteristics are however not significantly affected by the presence of Ce.The storage capacity of the PtBa/Al sample is hardly affected by the presence of Ce; however Ce favours the thermal decomposition of the stored NOx species. The Ce-doped sample also shows a slightly higher reactivity in the reduction of the stored NOx by H2: in fact the reaction is monitored at lower temperatures. A slightly higher selectivity towards the formation of N2 is also observed.

Graphical abstractHRTEM image of the Ce-doped PtBa/Al2O3 catalyst.Figure optionsDownload full-size imageDownload high-quality image (182 K)Download as PowerPoint slideHighlights► The presence of Ce does not alter the morphological characteristics of PtBa/Alumina sample. ► Ce reduces the thermal stability of the adsorbed nitrites and nitrates. ► The presence of Ce favours the reduction of the stored NOx.

Keywords
Pt-Ba/Al2O3 catalyst; Ceria; NOx storage; NOx reduction mechanism; LNT systems; Temperature programmed surface reaction
First Page Preview
Characterization and reactivity of Ce-promoted PtBa lean NOx trap catalysts
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: Catalysis Today - Volume 197, Issue 1, 15 December 2012, Pages 178–189
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