Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 368, Issue -, Pages 456-461Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.11.030
Keywords
Fischer-Tropsch synthesis; Mesoporous carbon supported Co; K and Zr promoters; Surface acidity and basicity; Adsorption heats
Categories
Funding
- NSFC [21073089, 20673055]
- MSTC [2005CB221400]
- Jiangsu Province [BE2009145]
- fundamental research funds for central universities [1084020501]
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The mesoporous carbon supported cobalt catalyst (15%Co/MC) was found to be more active and selective to C-5(+) than the traditionally activated carbon supported one (15%Co/AC) for the Fischer-Tropsch synthesis (FTS). The addition of small amount of K2O and ZrO2 significantly affected the FTS behavior of 15%Co/MC. The addition of 1% K inhibited the FTS activity dramatically, while the addition of 3% Zr increased the FTS activity significantly. The addition of K2O decreased the surface acidity while increased the surface basicity of 15%Co/MC, resulting in the increased heat of adsorption of CO and substantially decreased heat of adsorption of H-2 on Co. In contrast, the addition of ZrO2 increased the surface acidity and heat of adsorption of H-2 on Co. The FTS activity was found to be related to the ratio of heats for the adsorption of CO and H-2 on the catalysts 15%Co/MC, 15%Co-1%K/MC and 15%Co-3%Zr/MC. The highest FTS activity was obtained on the catalyst with the heat ratio of 1.2. (C) 2011 Elsevier Inc. All rights reserved.
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