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|Title:||Effect of boron promotion on the stability of cobalt Fischer-Tropsch catalysts|
|Source:||Tan, K.F., Chang, J., Borgna, A., Saeys, M. (2011-05-16). Effect of boron promotion on the stability of cobalt Fischer-Tropsch catalysts. Journal of Catalysis 280 (1) : 50-59. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jcat.2011.03.002|
|Abstract:||Density functional theory (DFT) calculations indicate that boron atoms are thermodynamically stable at step, p4g clock, and subsurface sites of a Co catalyst under Fischer-Tropsch synthesis (FTS) conditions. Moreover, the presence of boron at step and clock sites is calculated to destabilize the adsorption of carbon atoms at neighboring sites by +160 and +108 kJ/mol, respectively. The calculations hence suggest that boron promotion can selectively block the deposition, nucleation, and growth of resilient carbon species. To experimentally evaluate this concept, the deactivation of a 20 wt.% Co/γ-Al2O3 catalyst promoted with 0.5 wt.% boron was studied for 200 h during FTS at 240 °C and 20 bar. Boron promotion was found to reduce the deactivation rate more than six-fold, without affecting the initial activity or selectivity. Characterization with X-ray photoelectron spectroscopy (XPS) and temperature-programmed hydrogenation (TPH) confirms that boron promotion reduces the deposition of resilient carbon species. © 2011 Elsevier Inc. All rights reserved.|
|Source Title:||Journal of Catalysis|
|Appears in Collections:||Staff Publications|
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