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Highly and stably dispersed Pt catalysts supported over La1−xSrxAlO3−0.5x perovskite for oxidative methane activation and their structures

Paper ID Volume ID Publish Year Pages File Format Full-Text
40443 45854 2013 11 PDF Available
Title
Highly and stably dispersed Pt catalysts supported over La1−xSrxAlO3−0.5x perovskite for oxidative methane activation and their structures
Abstract

•High metal dispersion of Pt/La1−xSrxAlO3−0.5x in an oxidative atmosphere.•The dispersion of supported Pt increased at higher oxidative-treatment temperature.•Pt/La0.7Sr0.3AlO2.85 catalyst showed higher activity for oxidative methane reaction.•A strong interaction between metal and lattice oxygen of perovskite inhibited migration.

Catalytic activity for oxidative methane conversion (partial oxidation of methane) over Pt catalyst supported on La1−xSrxAlO3−0.5x was investigated. Pt/La0.7Sr0.3AlO2.85 showed higher and more stable hydrogen yield than Pt/α-Al2O3 did. Pt/La0.7Sr0.3AlO2.85 showed higher catalytic activity for steam reform of methane even in an oxidative atmosphere, which was attributable to high Pt dispersion in the oxidative reaction atmosphere. Pt dispersion over La0.8Sr0.2AlO2.9 or La0.7Sr0.3AlO2.85 increased concomitantly with increasing calcination temperature in air. This phenomenon was not observed by aging in He flow. From structural analyses using XRD, XPS, EXAFS, and XANES, the interaction or coordination between Pt and surface oxygen (Os) was observed. This coordination was weakened in a reductive atmosphere and regenerated in an oxidative atmosphere. This interaction or coordination between the Pt and La1−xSrxAlO3−0.5x contributed to high Pt dispersion in an oxidative atmosphere and to high catalytic activity for the partial oxidation of methane.

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Keywords
Pt catalyst; Perovskite support; Partial oxidation of methane; High dispersion; Oxidative atmosphere; Lattice oxygen
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Highly and stably dispersed Pt catalysts supported over La1−xSrxAlO3−0.5x perovskite for oxidative methane activation and their structures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 458, 10 May 2013, Pages 71–81
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