Please use this identifier to cite or link to this item:
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
Fischer-Tropsch synthesis
Issue Date: 16-May-2011
Citation: 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.
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
ISSN: 00219517
DOI: 10.1016/j.jcat.2011.03.002
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Sep 19, 2018


checked on Sep 19, 2018

Page view(s)

checked on Aug 24, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.