Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jcat.2011.03.002
Title: Effect of boron promotion on the stability of cobalt Fischer-Tropsch catalysts
Authors: Tan, K.F.
Chang, J.
Borgna, A.
Saeys, M. 
Keywords: Boron
Carbon deposition
Deactivation
Fischer-Tropsch synthesis
Promotion
Issue Date: 16-May-2011
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
URI: http://scholarbank.nus.edu.sg/handle/10635/88788
ISSN: 00219517
DOI: 10.1016/j.jcat.2011.03.002
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