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Structured catalyst for the catalytic combustion of soot: Co,Ba,K/ZrO2 supported on Al2O3 foam

Paper ID Volume ID Publish Year Pages File Format Full-Text
42697 45937 2009 10 PDF Available
Title
Structured catalyst for the catalytic combustion of soot: Co,Ba,K/ZrO2 supported on Al2O3 foam
Abstract

An alumina foam has been coated with a thin layer of ZrO2 by washcoating and impregnated with Co, Ba and K, which are active ingredients for soot combustion and NOx adsorption processes. The ZrO2 coating exhibits an arrangement of interconnected surface cracks, due to the shrinkage of the Zr(OH)x layer during the drying process, and the high temperature treatment (700 °C), needed to remove and burn the colloidal stabilizer present in the slurry used during the washcoating procedure. However, the coating showed a good adherence when subjected to an ultrasonic test, and improved after the impregnation of the active components (K, Ba and Co), probably due to a partial melting of the potassium salt. The ZrO2-foam was less active for the soot combustion compared to the Co,Ba,K/ZrO2-foam, confirming that the Co, Ba and K species present on the coating acted as active elements; thus, the process employed to incorporate them proved to be effective. Although a shrinkage–crack pattern of flakes (mainly composed of Co,Ba,K/ZrO2) and cracks (rich in Al2O3) was observed in the catalytic film, the system showed to be active and stable for the catalytic combustion of soot. The maximum in the combustion rate depends upon the amount of soot loaded and the presence of NO in the feed, having a performance comparable to that obtained with the powder catalyst.

Graphical abstractAn alumina foam, coated with ZrO2, was impregnated with Co, Ba and K and resulted to be active and stable for diesel soot combustion. The ZrO2 film exhibited a good adherence, which improved after the impregnation of the active components, although a shrinkage–crack pattern of flakes (mainly composed of Co,Ba,K/ZrO2) and cracks (rich in Al2O3) were observed.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Structured catalyst; Soot combustion; Al2O3 foam; ZrO2 coating
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Structured catalyst for the catalytic combustion of soot: Co,Ba,K/ZrO2 supported on Al2O3 foam
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 362, Issues 1–2, 30 June 2009, Pages 129–138
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