fulltext.study @t Gmail

Nanofibrous Pt-Ba Lean NOx trap catalyst with improved sulfur resistance and thermal durability

Paper ID Volume ID Publish Year Pages File Format Full-Text
55721 47063 2011 10 PDF Available
Title
Nanofibrous Pt-Ba Lean NOx trap catalyst with improved sulfur resistance and thermal durability
Abstract

Different LNT catalysts, prepared using γ-Al2O3, nanofibrous Al2O3 and TiO2-modified nanofibrous Al2O3 supports, with Ba as the storage component and Pt as the oxidation component, have been prepared and NOx uptake behaviour was examined between 523 and 823 K. The activity study was accompanied by TEM, XRD and H2 chemisorption characterization. The Pt-Ba nanofibrous Al2O3-supported catalyst resulted in the best performance, likely due to better Pt dispersion. This included improved storage capacity as well as more efficient reduction during the regeneration phase. This catalyst also had better performance after identical S exposures and after desulfurization. Ti modification had significant impact on sample thermal durability and general catalyst performance. Results using the Al2O3-TiO2 nanofibrous catalyst reveal that this catalyst has improved thermal degradation resistance properties relative to standard γ-Al2O3. Ti incorporation in the nanofibrous Al structure was found to also promote sulfur desorption. Above 1073 K, where complex BaxTiyOz, and/or BaxAlyTizOn structures form, the Ba-Ti interaction was found to have a destabilizing effect on stored nitrites/nitrates.

Graphical abstract. The newly developed Pt-Ba nanofibrous Al2O3-supported catalyst demonstrated enhanced NSR performance, including improved storage capacity as well as more efficient reduction during the regeneration phase, compared with standard Pt/Ba/Al2O3. This catalyst also had better performance after identical S exposures and after desulfurization.Figure optionsDownload full-size imageDownload high-quality image (413 K)Download as PowerPoint slideHighlights► Improved surface area and Pt dispersion. ► Improved NOx trapping ability. ► Improved NOx reduction during regeneration. ► Improved performance after S exposure and desulfurization.

Keywords
NOx storage; Pt-Ba/Al2O3; Thermal durability; Sulfur resistance
First Page Preview
Nanofibrous Pt-Ba Lean NOx trap catalyst with improved sulfur resistance and thermal durability
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 175, Issue 1, 25 October 2011, Pages 55–64
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