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Importance of re-oxidation of palladium by interaction with lanthana for propane combustion over Pd/Al2O3 catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
55092 47040 2013 6 PDF Available
Title
Importance of re-oxidation of palladium by interaction with lanthana for propane combustion over Pd/Al2O3 catalyst
Abstract

Lanthana-modified Pd/Al2O3 catalyst was prepared using an incipient wet impregnation method followed by aging in a steam-containing air at 1050 °C for 5 h. The loading of lanthana inhibited the phase transformation of gamma alumina and the sintering of palladium during the thermal aging, resulting in a higher dispersion of palladium on the aged catalyst. The C3H8 oxidation activities of the catalysts were measured by temperature-programmed reaction after the oxidative, reductive and inert pre-treatments. The catalytic activity of the catalyst was found to be determined mainly by the oxidation state of Pd. The lanthana-modified catalyst exhibited a superior activity in respect to the lanthana-free catalyst after the reducing and inert pre-treatments, while both the pre-oxidized catalysts show similar propane oxidation activities. Oxidized palladium was more active than metallic species for propane combustion. A higher Pd2+/Pd ratio was detected on the aged Pd/La/Al2O3 catalyst by XPS. The CO-IR and TGA results proved that the metallic palladium species can be more quickly re-oxidized by interaction with lanthana at low temperatures.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (142 K)Download as PowerPoint slideHighlights► The propane oxidation activity of aged Pd/Al2O3 is enhanced by introduction of lanthana. ► The catalytic activity of propane oxidation is greatly dependence on the oxidation state of palladium. ► The oxidized palladium is more active than metallic species for propane oxidation. ► Metallic palladium species can be more readily re-oxidized by interaction with lanthana at low temperatures.

Keywords
Pd–La interaction; Propane combustion; Re-oxidation; Aging
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Importance of re-oxidation of palladium by interaction with lanthana for propane combustion over Pd/Al2O3 catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 201, 1 March 2013, Pages 19–24
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