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Optimization of the preparation procedure of cobalt modified silicas as catalysts in methanol decomposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
41178 45879 2012 11 PDF Available
Title
Optimization of the preparation procedure of cobalt modified silicas as catalysts in methanol decomposition
Abstract

Novel modified “chemisorption–hydrolysis” technique and conventional “incipient wetness impregnation” procedure were compared for loading of cobalt species on mesoporous silica supports. Effect of cobalt amount, pH of the precursor solution, duration of the “chemisorption” procedure and pre-treatment medium, as well as topological characteristics of the mesoporous silica support were investigated. The state of the loaded cobalt species was studied by XRD, FTIR, FTIR of adsorbed pyridine, UV–vis, XPS and TPR methods and their catalytic properties were elucidated in methanol decomposition to hydrogen and carbon monoxide. The “incipient wetness impregnation” technique facilitates the formation of finely dispersed spinel cobalt oxide species. Their catalytic activity could be significantly increased by hydrogen pretreatment, but the effect is more pronounced when mesoporous silica with ordered pseudo 1D pore structure (SBA-15) is used as a support. The modified “chemisorption–hydrolysis” procedure facilitates the formation of strongly interacting with the support cobalt species, which are stable under the reduction conditions. Their properties could be regulated during the modification procedure, by varying the cobalt content and pH of the impregnated solution as well as by the duration of the “chemisorption” procedure.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (63 K)Download as PowerPoint slideHighlight► Novel chemisorption–hydrolysis method for loading of cobalt on mesoporous silicas. ► Wetness impregnation facilitates formation of finely dispersed Co3O4 particles. ► Chemisorption–hydrolysis produces strongly interacted with the support species. ► Successful control of cobalt phase composition by varying chemisorption procedure. ► Under reduction medium pore topology of silica strongly affects catalytic activity.

Keywords
SBA-15; KIT-6; Cobalt modifications; Post-synthesis modification; Pore topology effect; Methanol decomposition
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Optimization of the preparation procedure of cobalt modified silicas as catalysts in methanol decomposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 417–418, 29 February 2012, Pages 209–219
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