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Studies on surface impregnation combustion method to prepare supported Co/SiO2 catalysts and its application for Fischer–Tropsch synthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
40836 45867 2012 8 PDF Available
Title
Studies on surface impregnation combustion method to prepare supported Co/SiO2 catalysts and its application for Fischer–Tropsch synthesis
Abstract

A series of supported Co/SiO2 catalysts were prepared by surface impregnation combustion method using cobalt nitrates and citric acid, and the precursors were burnt in different atmospheres. The effects of different calcination atmospheres on the properties of the supported Co/SiO2 catalysts were systemically studied by TG-DTA, XRD, Raman spectrum, TPR, in situ FTIR, TEM, BET and H2-chemisorption techniques. The burnt catalyst Cargon-air-reduction which was first burnt in argon and then oxidized in air had about 10 nm Co3O4 crystalline size, much smaller than that which was directly burnt in air (Co3O4 size: about 15 nm) and that prepared by conventional impregnation method (Co3O4 size: about 32 nm) using cobalt nitrate as impregnating solution. Characterizations and FTS results of two other references using different organic cobalt salt aqueous (cobalt acetate and cobalt citrate) as impregnating solution were also added in the supporting information. Comparing with our previously reported Cargon catalyst directly burnt in the argon atmosphere without further reduction, the influence from surface amorphous carbon and carbonic residues was completely eliminated. The activity of the burnt catalyst Cargon-air-reduction prepared by surface impregnation method was threefold higher than that of the reference CN-reduction prepared by conventional incipient-wetness impregnation method. The surface impregnation combustion method described herein was promising to prepare highly dispersed supported metallic catalysts with smaller particle sizes.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (229 K)Download as PowerPoint slideHighlights► Highly dispersed Co/SiO2 catalysts were prepared by surface impregnation combustion method. ► Co3O4 crystalline sizes of the as-prepared catalysts were only about 10 nm. ► The activity of the as-prepared catalysts for FTS was higher.

Keywords
Surface impregnation combustion; Metallic catalysts; Co/SiO2; Fischer–Tropsch synthesis
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Studies on surface impregnation combustion method to prepare supported Co/SiO2 catalysts and its application for Fischer–Tropsch synthesis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 435–436, 5 September 2012, Pages 217–224
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