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Partial oxidation and autothermal reforming of methane on Pd/CeO2–Al2O3 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43483 45972 2008 10 PDF Available
Title
Partial oxidation and autothermal reforming of methane on Pd/CeO2–Al2O3 catalysts
Abstract

The surface properties and catalytic behavior of Pd/xCeO2–Al2O3 catalysts in partial oxidation of methane and autothermal reforming of methane were investigated. There was an increase on ceria's apparent crystallite sizes with the increase of CeO2 loadings and with the rise of the calcination temperatures of the supports from 500 to 900 °C. A decrease on the density of Pd sites was observed with the use of supports calcined at lower temperature and with the increase of CeO2 loadings. However, CO linearly bonded/CO bridged bonded intensity ratios showed an opposite trend. This apparent disagreement could be due to the partial coverage of Pd sites by CeOx species. Pd/Al2O3 catalyst was strongly deactivated during partial oxidation or autothermal reforming of methane, while catalysts with higher ceria loadings exhibited superior stability. Pd/xCeO2–Al2O3 catalysts show an increase of activity for autothermal reforming of methane with the increase of CeO2 loading. Therefore, the activity and stability apparently decrease with Pd dispersion. This fact was ascribed to partial coverage of Pd by [CePdxO]Pd0 species, which show high ability to promote the gasification of coke. The formation of [CePdxO]Pd0 species results in a decrease of the density of Pd sites but led to higher accessibility of the active sites to methane.

Graphical abstractPd/Al2O3 catalyst was strongly deactivated during partial oxidation or autothermal reforming of methane, while CeO2-containing catalysts exhibited higher stability for high CeO2 loading. The activity and stability apparently decrease with Pd dispersion. This fact was ascribed to partial coverage of Pd by [CePdxO]Pd0-like species, which result in a higher accessibility of the active sites to methane. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Partial oxidation of methane; Autothermal reforming of methane; Pd/Ce–Al2O3 catalysts; CeO2; Palladium on alumina; CO adsorption
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Partial oxidation and autothermal reforming of methane on Pd/CeO2–Al2O3 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 348, Issue 2, 15 October 2008, Pages 183–192
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