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Structural and thermal study of carbon-modified molybdenum sub-oxide catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43707 45984 2007 8 PDF Available
Title
Structural and thermal study of carbon-modified molybdenum sub-oxide catalysts
Abstract

The phase composition and the physico-chemical nature of the “carbon-modified molybdenum sub-oxide” catalyst during the isomerization of n-heptane were studied. It was found that different phases of molybdenum sub-oxides coexist, MoO2, MoO, besides MoO3−x. Our results indicate that MoO is present as dispersed nano-structures inside the bulk catalysts. The thermal oxidation study revealed that the O2 is consumed to oxidize part of the reduced oxide as well as carbonaceous deposits simultaneously, giving an additional evidence of the mixture of oxide phases during reaction. A thermo-kinetic study of the different oxidation process is included and the results are discussed in terms of the activation energy for the oxidation of each phase. The structural and thermal characterization has revealed the complexity of the system, but has also opened a window to a new insight into the understanding of MoO3 catalyst.

Graphical abstractThe formation of molybdenum sub-oxides during the reduction of the MoO3 catalyst has been extensively studied. However, the nature of the surface species during isomerization processes is not yet fully understood. The purpose of this work is to show a more realistic chemical approach to the complexity of this system and to raise a novel understanding of its catalytic behavior during isomerization reactions.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Molybdenum oxide; Raman spectroscopy; Surface structure; Carbon-modified molybdenum sub-oxide; Thermal analysis; Heterogeneous catalysis
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Structural and thermal study of carbon-modified molybdenum sub-oxide catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 321, Issue 2, 11 April 2007, Pages 117–124
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