Journal ArticleDOI
Fischer–Tropsch synthesis: A review of water effects on the performances of unsupported and supported Co catalysts
Ajay K. Dalai,Burtron H. Davis +1 more
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TLDR
In this article, the effects of water on the performances of various cobalt catalysts for Fischer-Tropsch synthesis (FTS) are discussed. But the authors focus on the effect of water in terms of the performance of cobalt-based catalysts.Abstract:
Fischer–Tropsch synthesis (FTS) process aims at converting synthesis gas to liquid fuels. Due to high activity and long catalyst life, cobalt-based catalyst is currently the catalyst of choice for gas to liquid (GTL) technology. Water is most undesirable byproduct of FTS process. Due to low water–gas-shift (WGS) activity of cobalt-based catalyst, the water concentration rises with time-on-stream (TOS) in FTS. This paper reviews the effects of water on the performances of various cobalt catalysts for FTS. The effects of water on FTS is quite complex and depends on the support and its nature, Co metal loading, its promotion with noble metals, and preparation procedure. Added water up to certain concentrations has positive effects (in terms of higher CO conversion, C 5+ selectivity, olefin selectivity and lower methane and CO 2 selectivity) on unsupported cobalt oxide catalysts. If the effects of support are taken into account, water has positive effect for silica-supported catalysts. The effects are negative for alumina where as for titania support, water has little positive effect. However in general, oxidation of cobalt active site depending on the cluster size and water partial pressure, the removal of transport restrictions via the formation of water-rich intra-pellet liquids, and kinetic effects have been considered as the main responsible factors. The effects are strongly influenced by the cobalt cluster size as well as on pore size of the support. Addition of noble metals at low cobalt loading increases the dispersion of cobalt on the support and hence improves its activity. Higher cobalt dispersion enhances the negative impact of water especially at higher water partial pressures under FTS conditions.read more
Citations
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Heterogeneous Catalyst Deactivation and Regeneration: A Review
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Deactivation of cobalt based Fischer―Tropsch catalysts: A review
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A review of advanced catalyst development for Fischer–Tropsch synthesis of hydrocarbons from biomass derived syn-gas
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Journal ArticleDOI
Water-Mediated Mars–Van Krevelen Mechanism for CO Oxidation on Ceria-Supported Single-Atom Pt1 Catalyst
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References
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Journal ArticleDOI
Design, synthesis, and use of cobalt-based Fischer-Tropsch synthesis catalysts
TL;DR: In this article, Fischer-Tropsch synthesis (FTS) catalysts with high cobalt concentration and site density are used for the synthesis of hydrocarbons from CO/H2 mixtures.
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Fischer-Tropsch synthesis on cobalt and ruthenium. Metal dispersion and support effects on reaction rate and selectivity
TL;DR: In this paper, metal dispersion and support effects on Fischer-Tropsch synthesis rate and selectivity were studied at conditions that favor the information of C5+ hydrocarbons (> 80% selectivity).
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Practical and theoretical aspects of the catalytic Fischer-Tropsch process
TL;DR: The development, current status as well as the future of the Fischer-Tropsch (FT) process is reviewed in this paper, where the first commercial scale slurry (3 phase) reactor and an improved version of the 2-phase fluidized bed reactor were successfully commissioned.
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The stoichiometries of H2 and CO adsorptions on cobalt: Effects of support and preparation
TL;DR: In this article, high temperature hydrogen adsorption and conventional 298 K adsorptions of hydrogen and carbon monoxide were characterized by unsupported cobalt and cobalt supported on silica, alumina, titania, magnesia, and carbon.
Journal ArticleDOI
Catalytic synthesis of hydrocarbons from carbon monoxide and hydrogen
TL;DR: The Fischer-Tropsch synthesis reaction as mentioned in this paper is commonly referred to as the Fischer reaction and is used to produce a variety of organic products from coal, residua, oil shale, and tar sands.