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Methane dry reforming with CO2: A study on surface carbon species

Paper ID Volume ID Publish Year Pages File Format Full-Text
42477 45927 2010 11 PDF Available
Title
Methane dry reforming with CO2: A study on surface carbon species
Abstract

Methane dry reforming with a mixture of 29% CO2 and 71% CH4 over 8 wt% NiMgAl2O4 in a plug flow reactor with temperature programmed mode has been investigated. It was established that in sequential reactions the catalyst was deactivated due to graphite like carbon deposit measured by means of X-ray diffraction (XRD), transmission electron microscopy (TEM) while by X-ray photoelectron spectroscopy (XPS) only Ni–carbide was observed. The discrepancy found by XPS and TEM can be explained by the different types of carbon species, i.e. it is assumed that after the first reaction mostly carbide is deposited, whereas after several subsequent reactions the carbon on the surface is graphitized forming carbon nanotubes (TEM). Addition of 0.5 wt% gold to NiMgAl2O4 improves the catalytic activity and on gold containing bimetallic catalyst the formation of nanotubes is vanished. The results are interpreted by the formation of non-crystalline NiCx which – depending on the conditions – is transferred to graphitic carbon species.

Graphical abstractIn methane dry reforming on Ni/MgAl2O4 and Au-Ni/MgAl2O4 catalyst after the first reaction most of the carbon deposited is carbide (XPS), whereas after several subsequent reactions the carbon on the surface is graphitized forming carbon nanotubes (TEM). Addition of gold drastically reduces the formation of graphite and CMWNT and affect the activity of Ni.Figure optionsDownload full-size imageDownload high-quality image (137 K)Download as PowerPoint slide

Keywords
Methane dry reforming; Structure of coke; XRD; TEM; XPS studies
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Methane dry reforming with CO2: A study on surface carbon species
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 375, Issue 2, 1 March 2010, Pages 236–246
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
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Any Questions? feel free to contact us