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Characterization of iron-cobalt oxide catalysts: Effect of different supports and promoters upon the structure and morphology of precursors and catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
44635 46046 2006 12 PDF Available
Title
Characterization of iron-cobalt oxide catalysts: Effect of different supports and promoters upon the structure and morphology of precursors and catalysts
Abstract

The effect of a range of preparation variables such as the precipitate ageing time and [Fe]/[Co] molar ratio of precipitation solution on the composition and morphology of iron-cobalt oxide catalysts prepared using a co-precipitation method is described and the optimum preparation conditions were identified with respect to the catalyst activity for the Fisher–Tropsch reaction. The effect of different promoters along with loadings of optimum support and promoter on the activity and selectivity of the 40%Fe/60%Co as an optimum molar ratio are studied and it was found that the catalyst containing 40%Fe/60%Co/15 wt%SiO2/1.5 wt%K which aged for 2 h, is an optimum modified catalyst for the conversion of synthesis gas to ethylene and propylene. The results are interpreted in terms of the structure of the active catalyst. Characterization of both precursors and calcined catalysts were carried out using XRD, SEM, BET specific surface area and thermal analysis methods such as TGA and DSC. It was shown that all the different preparation variables influenced the catalyst precursor structure and morphology.

Keywords
Catalyst characterization; Precipitate ageing; Iron-cobalt oxide; Fischer–Tropsch synthesis; Morphology; Catalyst structure
First Page Preview
Characterization of iron-cobalt oxide catalysts: Effect of different supports and promoters upon the structure and morphology of precursors and catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 301, Issue 2, 24 February 2006, Pages 272–283
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis