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dc.contributor.authorMa, Wenping
dc.contributor.authorShafer, Wilson D.
dc.contributor.authorJacobs, Gary
dc.contributor.authorYang, Jia
dc.contributor.authorSparks, Dennis E.
dc.contributor.authorHamdeh, Hussein H.
dc.contributor.authorDavis, Burtron H.
dc.identifier.citationMa, Wenping; Shafer, Wilson D.; Jacobs, Gary; Yang, Jia; Sparks, Dennis E.; Hamdeh, Hussein H.; Davis, Burtron H. 2018. Fischer-Tropsch synthesis: effect of CO conversion on CH4 and oxygenate selectivities over precipitated Fe-K catalysts. Applied Catalysis A: General, vol. 560:pp 144-152en_US
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractThe explanation for CH4 selectivity for iron based Fischer-Tropsch catalysts in the low conversion region (Le., < 50%) remains elusive. In this contribution, the CO conversion effect was carefully examined over four K promoted Fe catalysts (100 Fe/5.1Si/2Cu/ x K, where x = 1-5) over a wide range of CO conversion (i.e., 4-85%). Moreover, the effect of CO conversion on oxygenate selectivity of the Fe-K catalysts was carefully studied as well. The change in CH4 selectivity with CO conversion was found to resemble asymmetric "V" shaped curves, with the minimum values occurring at approximately 50% CO conversion. Adding greater than x = 2 K significantly alleviated the CO conversion effect which was attributed to the high K loading greatly decreasing the surface H coverage while improving CO adsorption. The unique CH4 selectivity trend suggests a complicated CH4 formation process that results from different aspects of the catalyst (i.e., chain growth and hydrogenation rates), and process conditions. Oxygenate selectivity was in the range of 0.7-2.8% and varied with the CO conversion and K loading. The addition of K up to x = 3 was found to promote oxygenate formation and chain growth. The overall oxygenate distribution up to C-17 follows an Anderson-Schulz Flory (ASF) distribution, with ethanol being the dominant oxygenate. Mechanisms of oxygenate formation different from that of hydrocarbon formation (e.g., CO insertion versus CO dissociation) were proposed to explain the experimental results.en_US
dc.relation.ispartofseriesApplied Catalysis A: General;v.560
dc.subjectFischer-Tropsch synthesisen_US
dc.subjectIron catalystsen_US
dc.subjectCO conversion effecten_US
dc.subjectCH4 selectivity oxygenate selectivityen_US
dc.subjectK promoteren_US
dc.titleFischer-Tropsch synthesis: Effect of CO conversion on CH4 and oxygenate selectivities over precipitated Fe-K catalystsen_US
dc.rights.holder© 2018 Elsevier B.V. All rights reserved.en_US

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