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dc.contributor.authorPendyala, Venkat Ramana Rao
dc.contributor.authorGraham, Uschi M.
dc.contributor.authorJacobs, Gary
dc.contributor.authorHamdeh, Hussein H.
dc.contributor.authorDavis, Burtron H.
dc.identifier.citationPendyala, V. R. R., Graham, U. M., Jacobs, G., Hamdeh, H. H. and Davis, B. H. (2014), Fischer–Tropsch Synthesis: Morphology, Phase Transformation, and Carbon-Layer Growth of Iron-Based Catalysts. ChemCatChem, vol. 6:no. 7:pp 1952–1960. doi: 10.1002/cctc.201402073en_US
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractThe morphological, phase transformations and carbon-layer growth for unpromoted and K-promoted iron catalysts were investigated over time during Fischer-Tropsch synthesis. Catalysts were activated in CO for 24 h, which transformed hematite into a mixture containing 93% iron carbide and 7% magnetite for the unpromoted catalyst and 81% iron carbide and 19% magnetite for the K-promoted catalyst. Initially, the activated catalysts had high CO conversions (approximate to 85%); however, the conversions decreased to approximately 30% after approximately 280 h of synthesis time. For the unpromoted catalyst, the amount of iron carbide gradually decreased over time while the corresponding magnetite phase increased. However, for the K-promoted one, only one iron carbide phase (X-Fe5C2) gradually decreased, while the other (epsilon-Fe2.2C) phase steadily increased and magnetite remained unchanged. TEM analyses revealed that for the K-promoted catalyst, carbon deposition increased over time, unlike that of the unpromoted catalyst.en_US
dc.description.sponsorshipUniversity of Wyoming contract number 1001541-Davis and the Commonwealth of Kentucky.en_US
dc.publisherJohn Wiley & Sons, Inc.en_US
dc.subjectMossbauer spectroscopyen_US
dc.titleFischer-Tropsch synthesis: Morphology, phase transformation, and carbon-layer growth of iron-based catalystsen_US
dc.rights.holder© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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