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Catalysts 2018, 8(2), 77; https://doi.org/10.3390/catal8020077

Effect of Support Pretreatment Temperature on the Performance of an Iron Fischer–Tropsch Catalyst Supported on Silica-Stabilized Alumina

1
Department of Chemical Engineering, Brigham Young University, Provo, UT 84602, USA
2
Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
3
Department of Physics, Wichita State University, Wichita, KS 67260, USA
*
Author to whom correspondence should be addressed.
Received: 12 December 2017 / Revised: 26 January 2018 / Accepted: 29 January 2018 / Published: 12 February 2018
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Abstract

The effect of support material pretreatment temperature, prior to adding the active phase and promoters, on Fischer–Tropsch activity and selectivity was explored. Four iron catalysts were prepared on silica-stabilized alumina (AlSi) supports pretreated at 700 °C, 900 °C, 1100 °C or 1200 °C. Addition of 5% silica to alumina made the AlSi material hydrothermally stable, which enabled the unusually high support pretreatment temperatures (>900 °C) to be studied. High-temperature dehydroxylation of the AlSi before impregnation greatly reduces FeO·Al2O3 surface spinel formation by removing most of the support-surface hydroxyl groups leading to more effectively carbided catalyst. The activity increases more than four-fold for the support calcined at elevated temperatures (1100–1200 °C) compared with traditional support calcination temperatures of <900 °C. This unique pretreatment also facilitates the formation of ε′-Fe2.2C rather than χ-Fe2.5C on the AlSi support, which shows an excellent correlation with catalyst productivity. View Full-Text
Keywords: Fischer–Tropsch synthesis; supported iron catalyst; silica-stabilized alumina; support pretreatment temperature; iron carbide Fischer–Tropsch synthesis; supported iron catalyst; silica-stabilized alumina; support pretreatment temperature; iron carbide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Keyvanloo, K.; Huang, B.; Okeson, T.; Hamdeh, H.H.; Hecker, W.C. Effect of Support Pretreatment Temperature on the Performance of an Iron Fischer–Tropsch Catalyst Supported on Silica-Stabilized Alumina. Catalysts 2018, 8, 77.

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