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Effect of the zirconia addition manner on the modification of Fe–SiO2 interaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
55417 47052 2012 9 PDF Available
Title
Effect of the zirconia addition manner on the modification of Fe–SiO2 interaction
Abstract

A series of ZrO2-modified Fe/SiO2 catalysts with the same composition were prepared by different methods. These solids were characterized by N2 adsorption, Fourier transform infrared spectroscopy, temperature-programmed reduction, temperature-programmed desorption, transmission electronic microscopy and Mössbauer spectroscopy. The results indicated that the modification of Fe–SiO2 interaction was strongly depended on the method of preparation. It was found that the strong Fe–SiO2 interaction could be effectively weakened if Zr species and SiO2 were pre-precipitated (Zr2-B and Zr2-C catalysts), even though the ZrO2 level was low. Consequently, the reduction and carburization ability of the catalyst was enhanced and the Fischer–Tropsch synthesis activity was increased eventually. The products selectivity variation trend indicated that the selectivity to gaseous and light hydrocarbons was increased, whereas that to heavy hydrocarbons and olefin was suppressed when the Zr species and SiO2 were precipitated before the precipitation of Fe3+ cation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (66 K)Download as PowerPoint slideHighlights► The Fe–SiO2 interaction could be explained in terms of the formation of Fe–O–Si bond. ► The strong Fe–SiO2 interaction could be modified by ZrO2. ► The modification effect was depended on the preparation method. ► The Fischer–Tropsch synthesis performance was improved by the addition of ZrO2.

Keywords
Fischer–Tropsch synthesis; Fe–SiO2 interaction; Zirconia modification; Preparation method; Fourier transform infrared spectroscopy
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Effect of the zirconia addition manner on the modification of Fe–SiO2 interaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 183, Issue 1, 20 March 2012, Pages 79–87
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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