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On the selectivity ...
On the selectivity of cobalt-based Fischer-Tropsch catalysts : Evidence for a common precursor for methane and long-chain hydrocarbons
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- Lögdberg, Sara (författare)
- KTH,Kemisk teknologi
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- Lualdi, Matteo (författare)
- KTH,Kemisk teknologi
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- Järås, Sven (författare)
- KTH,Kemisk teknologi
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Walmsley, John C. (författare)
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Blekkan, Edd A. (författare)
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Rytter, Erling (författare)
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Holmen, Anders (författare)
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(creator_code:org_t)
- Elsevier BV, 2010
- 2010
- Engelska.
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Ingår i: Journal of Catalysis. - : Elsevier BV. - 0021-9517 .- 1090-2694. ; 274:1, s. 84-98
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- A total of 36 cobalt-based supported catalysts were investigated in the Fischer-Tropsch reaction at industrially relevant process conditions: 483 K, 20 bar, molar H-2/CO ratio = 2.1, pellet size: 53-90 mu m. The effect of adding water vapour to the feed was investigated for 20 of the catalysts, and a H-2/CO ratio of 1.0 was used for a few catalysts. The catalysts differed in support material, Co loading, promoters, Cl content, Co particle size (larger than similar to 6 nm), morphology, degree of reduction and preparation technique and showed a large variation in selectivity. For each set of process conditions, a linear relationship seems to exist between the selectivity to methane (and other light products) and C5+ indicating a common precursor, i.e. a common monomer pool, for all hydrocarbon products. A high selectivity to C5+ is mainly an effect of a high intrinsic chain-growth probability and unlikely to be a result of an enhanced cc-olefin readsorption. The universal effect of external water addition on the hydrocarbon selectivities is limited to a decrease in the methane selectivity. A small proportion of the catalysts developed "pure methanation" sites upon exposure to high partial pressures of water.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
Nyckelord
- Fischer-Tropsch
- Cobalt
- Selectivity
- ASF
- Alpha value
- Methane
- Water
- H-2/CO ratio
- Physical chemistry
- Fysikalisk kemi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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