Journal article
Combined XRD and XANES studies of a Re-promoted Co/γ-Al2O3 catalyst at Fischer–Tropsch synthesis conditions
Norwegian University of Science and Technology1
Nano-Microstructures in Materials, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
Equinor ASA5
A cobalt based Fischer–Tropsch catalyst was studied during the initial stages of the reaction at industrially relevant conditions. The catalyst consists of 20wt% cobalt supported on γ-Al2O3 and promoted by 1wt% of rhenium. X-ray diffraction (XRD) in combination with X-ray absorption near edge structure (XANES) were used to reveal information on the particle and crystallite size and the oxidation states of the active component.
Conditions giving high selectivity towards light hydrocarbons (methanation, 673K, 10bar and high GHSV) were compared to conditions were higher hydrocarbons are the main products (FT synthesis at 483K, 18bar and low GHSV). The data analysis shows no significant changes in the cobalt crystallites during the first hours of Fischer–Tropsch synthesis.
Running the reaction at higher temperatures and predominantly methanation conditions led to significant sintering of the cobalt particles and a further reduction of a partially reduced catalyst could be observed.
| Language: | English |
|---|---|
| Year: | 2010 |
| Pages: | 289-295 |
| ISSN: | 18734308 and 09205861 |
| Types: | Journal article |
| DOI: | 10.1016/j.cattod.2009.10.010 |
| ORCIDs: | Johnsen, Rune and Norby, Poul |
