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Effect of Ce-doping on Rh/ZrO2 catalysts for partial oxidation of methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
44324 46015 2007 9 PDF Available
Title
Effect of Ce-doping on Rh/ZrO2 catalysts for partial oxidation of methane
Abstract

The partial oxidation of methane over supported (ZrO2, CeO2–ZrO2) rhodium catalysts was investigated at atmospheric pressure. The effect of temperature, CH4/O2 ratio, catalyst composition and pre-treatment was studied. Ceria doping of the support material resulted in significant improvements concerning the methane conversion and syngas selectivity, which could be related to a higher noble metal dispersion on the Rh/CeO2–ZrO2 catalyst. In addition, the light-off temperature was decreased by 128 °C when using CeO2–ZrO2 as support. X-ray photoelectron spectroscopy revealed the presence of different Rh oxidation states depending on catalyst composition and pre-treatment. A stabilization of partially oxidized (Rhδ+) species by ceria could be detected. An active and stable catalyst behavior could be observed for Rh/CeO2–ZrO2, irrespectively of catalyst pre-treatment, whereas an activation period was required for stabilizing the activity of the Rh/ZrO2 catalyst. The activity tests indicate that the indirect reaction mechanism, consisting of methane combustion followed by steam and dry reforming, prevails under the experimental conditions studied.

Graphical abstractThe partial oxidation of methane over supported (ZrO2, Ce–ZrO2) rhodium catalysts was investigated at atmospheric pressure. The effect of temperature, CH4/O2 ratio, catalyst composition and pre-treatment was studied. Ceria doping of the support material resulted in significant improvements concerning the methane conversion and syngas selectivity, which could mainly be related to a higher noble metal dispersion on the Rh/Ce–ZrO2 catalyst. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Partial oxidation of methane; Rh catalysts; Catalytic combustion; Ceria; XPS
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Effect of Ce-doping on Rh/ZrO2 catalysts for partial oxidation of methane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 326, Issue 1, 30 June 2007, Pages 8–16
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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