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In situ characterizations of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts for oxidative steam reforming of propane

Paper ID Volume ID Publish Year Pages File Format Full-Text
47529 46474 2009 8 PDF Available
Title
In situ characterizations of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts for oxidative steam reforming of propane
Abstract

Catalytic activity results of oxidative steam reforming of propane studied on Pd catalysts are here explained on the basis of different characterization analyses under reaction conditions. XRD in situ was applied to investigate nanostructure features by means of a Rietveld refinement giving additional information about ceria lattice parameter along the reaction. The refinement was applied in all pretreatment steps, after reduction and after reaction. A good correlation was obtained in all conditions. The mean crystallite sizes were calculated for CeO2, Pd0 and PdO at the higher intensity planes. Results of crystallite sizes after reaction during 1, 3, 8 and 20 h were determined. One can conclude that CeO2 enhances and maintains the dispersion of Pd on bulk catalyst and prevents Pd from severe aggregation along the reaction because no sintering was detected even after 20 h of reaction. The changes in lattice cell parameter determined by Rietveld refinement suggested high oxygen mobility inside the fluoritic structure, facilitating formation of CeO2−x species. DRIFTS were carried out under static and dynamic measurements and compared with TPD of propane in the presence of oxygen. These results showed formation of surface intermediate species (formates/carbonates) and CHz species on surface during the oxidative steam reforming of propane that allows proposing a surface reaction mechanism.

Keywords
DRIFTS; XRD in situ; Propane; Ceria; Palladium
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In situ characterizations of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts for oxidative steam reforming of propane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 92, Issues 1–2, 19 October 2009, Pages 217–224
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