fulltext.study @t Gmail

Co,Ba,K/ZrO2 coated onto metallic foam (AISI 314) as a structured catalyst for soot combustion: Coating preparation and characterization

Paper ID Volume ID Publish Year Pages File Format Full-Text
42173 45913 2010 10 PDF Available
Title
Co,Ba,K/ZrO2 coated onto metallic foam (AISI 314) as a structured catalyst for soot combustion: Coating preparation and characterization
Abstract

Co,Ba,K/ZrO2 coating onto the wall surface of an AISI 314 (American Iron and Steel Institute) foam was obtained using a sequential process: (1) original foam calcination, (2) ZrO2 layer formation and (3) active metal incorporation. After the different processes, the samples were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Laser Raman Spectroscopy (LRS), Energy Dispersive X-ray Analysis (EDX) and Scanning Electron Microscope (SEM) and the coating adherence was confirmed by means of an ultrasound test. Their catalytic behavior was evaluated using the soot combustion (Temperature-programmed Oxidation (TPO) and isothermal reactions). The soot particles were added via immersion in a 600-ppm soot suspension in n-hexane. The sequential process used to produce catalytic coatings proved to be efficient. After calcination at 900 °C, the wall surface of the original foam was covered with a uniform rich Cr oxide layer. This layer presented an interesting roughness, which favored the anchorage of the ZrO2 layer, obtained via washcoating. The latter layer was characterized by its mosaic-type morphology, an important fraction of the surface being rich in Zr (ZrO2 flakes). In this fraction, ZrO2 prevented the reaction between the active elements (Co, Ba, and K) and Cr2O3. The major components in the catalytic coating were Co3O4, BaCO3, KNO3 and ZrO2. Each one of these components and the synergy between them generated a good combination for catalysts to be used in the abatement of soot and NOx in diesel exhausts. The whole catalytic system has an interesting mechanical and thermal stability and the apparent activation energies for soot conversions lower than 0.5 (92 kJ mol−1) are comparable to the global activation energy reported for the powder Co,Ba,K/ZrO2 catalyst (82 kJ mol−1).

Graphical abstractThe structured catalyst obtained based on Co,Ba,K/ZrO2 coated onto the AISI 314 foam walls resulted to be stable and active for soot combustion. The sequential process used to produce catalytic coatings: (i) original foam calcination at 900 °C (ii) ZrO2 layer formation and iii) active metal incorporation proved to be efficient.Figure optionsDownload full-size imageDownload high-quality image (95 K)Download as PowerPoint slide

Keywords
Structured catalyst; Soot combustion; Metallic foam; Co,Ba,K/ZrO2 coating
First Page Preview
Co,Ba,K/ZrO2 coated onto metallic foam (AISI 314) as a structured catalyst for soot combustion: Coating preparation and characterization
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 A: General - Volume 379, Issues 1–2, 15 May 2010, Pages 95–104
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