Journal
JOURNAL OF CATALYSIS
Volume 359, Issue -, Pages 92-100Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2017.12.022
Keywords
Fischer-Tropsch; Supported cobalt catalyst; Alumina; Alumina-silica
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Funding
- BYU Fischer-Tropsch Consortium
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Four identically-prepared 20 wt% cobalt/0.15 wt% ruthenium Fischer-Tropsch catalysts, supported on different aluminas, were synthesized by incipient wetness impregnation, characterized, and compared based on their performance under standard Fischer-Tropsch synthesis conditions. Three alumina supports were obtained from commercial sources (Sasol, St. Gobain, and Alfa Aesar), while the fourth was made using a published technique that included 5 wt% silica. The silica-stabilized alumina catalyst produced superior Fischer-Tropsch rates of 49 mmol CO/g(cat) h, compared to the other catalysts on the commercial supports with rates of 26-39 mmol CO/g(cat) h. The improved performance of the silica-stabilized alumina support compared to the commercially available aluminas is ascribed to a bimodal pore structure with larger average diameters and enhanced thermal stability. The support can be thermally treated to higher temperatures (e.g., 1100 degrees C) without transformation into alpha-alumina, allowing dehydroxylation of the surface prior to impregnation to stabilize a nearly ideal dispersion of cobalt crystallites. (C) 2018 Elsevier Inc. All rights reserved.
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