2014
DOI: 10.1007/s10562-014-1336-z
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Abstract: The effect of potassium promoter loading (0, 0.5, 1.0 and 2.0 atomic ratio) on the performance of precipitated iron catalysts was investigated during FischerTropsch synthesis using a continuously stirred tank reactor. Characterization by temperature-programmed reduction with CO, Mössbauer effect spectroscopy, and transmission/ scanning transmission electron microscopy were used to study the effect of potassium promoter interactions on the carburization, phase transformation and carbon layer formation behavior … Show more

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Cited by 34 publications
(26 citation statements)
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“…In the used catalyst, the amount of ϵ‐Fe carbide increased with increasing K content, whereas the ϵ‐Fe 2.2 C content for the freshly activated catalysts remained more or less the same; this indicates that potassium enhanced the transformation of highly active χ‐Fe 5 C 2 carbide into less active ϵ‐Fe 2.2 C carbide. A similar result was reported by our group with CO hydrogenation over precipitated Fe catalysts . The origin of this transformation is not well understood.…”
Section: Resultssupporting
confidence: 81%
“…In the used catalyst, the amount of ϵ‐Fe carbide increased with increasing K content, whereas the ϵ‐Fe 2.2 C content for the freshly activated catalysts remained more or less the same; this indicates that potassium enhanced the transformation of highly active χ‐Fe 5 C 2 carbide into less active ϵ‐Fe 2.2 C carbide. A similar result was reported by our group with CO hydrogenation over precipitated Fe catalysts . The origin of this transformation is not well understood.…”
Section: Resultssupporting
confidence: 81%
“…The positive correlation between catalyst activity and ε′-Fe2.2C content is shown in Figure 9. It has been reported that the formation of χ-Fe2.5C is favored over unsupported Fe catalysts under typical FT conditions and identified as an active iron carbide phase [36,37]. Nevertheless, the catalysts used in most of those studies are unsupported, whereas the catalyst in the present study is supported with pretreated silica-stabilized alumina.…”
Section: Effects Of Support Pretreatment Temperature On Catalyst Perfmentioning
confidence: 78%
“…The catalytic performance of iron catalysts in high temperature FT synthesis is usually attributed to iron carbides [3][4][5]7,8,[37][38][39]. The presence of sodium affects iron carbidization.…”
Section: Discussionmentioning
confidence: 99%