The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
R. D. Srivastava - One of the best experts on this subject based on the ideXlab platform.
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Iron-based catalysts for slurry-phase Fischer-Tropsch Process: Technology review
Fuel Processing Technology, 1992Co-Authors: Gary J. Stiegel, G. Cinquegrane, R. D. SrivastavaAbstract:Abstract The slurry-phase reactor system is of interest in Fischer-Tropsch synthesis owing to the ability of the reactor system to efficiently remove the heat produced by the exothermic reaction. Iron-based catalysts are active for Fischer-Tropsch synthesis and for the water-gas shift reaction, and, in addition, are inexpensive. Hence, they have been examined in slurry-phase Fischer-Tropsch synthesis with CO-rich synthesis gas. The role of promoters, carbide phases, and oxide phases in iron-based catalysts is not well understood. The article reviews current knowledge of iron-based catalysts with reference to their application in slurry-phase Fischer-Tropsch synthesis. Areas of investigation requiring further research are identified.
David A King - One of the best experts on this subject based on the ideXlab platform.
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fischer tropsch mechanism revisited alternative pathways for the production of higher hydrocarbons from synthesis gas
Journal of Physical Chemistry C, 2008Co-Authors: Oliver R Inderwildi, Stephen J Jenkins, David A KingAbstract:Evidence from density functional theory calculations that the main reaction pathway for the Fischer−Tropsch Process on Co{0001} is not the carbide mechanism but an alternative branch starting with the hydrogenation of CO to an oxymethylidyne species. We show that hydrogenation is the main reaction path at realistic pressure using microkinetic simulations and thereby bridge the pressure gap in heterogeneous catalysis.
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Fischer−Tropsch Mechanism Revisited: Alternative Pathways for the Production of Higher Hydrocarbons from Synthesis Gas
The Journal of Physical Chemistry C, 2008Co-Authors: Oliver R Inderwildi, Stephen J Jenkins, David A KingAbstract:Evidence from density functional theory calculations that the main reaction pathway for the Fischer−Tropsch Process on Co{0001} is not the carbide mechanism but an alternative branch starting with the hydrogenation of CO to an oxymethylidyne species. We show that hydrogenation is the main reaction path at realistic pressure using microkinetic simulations and thereby bridge the pressure gap in heterogeneous catalysis.
Mark E. Dry - One of the best experts on this subject based on the ideXlab platform.
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The Fischer–Tropsch Process: 1950–2000
Catalysis Today, 2002Co-Authors: Mark E. DryAbstract:Abstract The decision to build a Fischer–Tropsch (FT) plant is still fraught with risk because it has to be based on the perceived future price and availability of petroleum crude oil and on local politics. The most expensive section of an FT complex is the production of purified syngas and so its composition should match the overall usage ratio of the FT reactions, which in turn depends on the product selectivity. The kinetics, reactor requirements, control of selectivity and the life of cobalt and iron catalysts are discussed and compared. Control of the FT conditions coupled with appropriate downstream Processes results in high yields of gasoline, excellent quality diesel fuel or high value linear α-olefins. The history of the various FT options and of the improvements in FT reactor technologies over the last 50 years is reviewed. It appears that “new” technologies are re-discovered in cycles of 15–30 years and it often takes the same time for the implementation of new concepts.
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High quality diesel via the Fischer–Tropsch Process – a review
Journal of Chemical Technology & Biotechnology, 2001Co-Authors: Mark E. DryAbstract:The Fischer–Tropsch (FT) synthesis is used to produce chemicals, gasoline and diesel fuel. The FT products are predominantly linear, hence the quality of the diesel fuel is very high, having cetane numbers of up to 75. Since purified synthesis gas is used in the FT Process all the products are S- and N-free. In this review the production of syngas and the various options used in the FT Process (reactors and catalyst types, and high and low temperature operation) are discussed. The best FT option for producing high quality diesel is using cobalt-based catalyst in slurry phase reactor, gearing the Process for high wax production and then selectively hydrocracking the wax to diesel fuel. The overall diesel pool has a high cetane number, the aromatic S and N contents are zero and the exhaust emissions are significantly lower than for standard diesel fuels. © 2001 Society of Chemical Industry
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Practical and theoretical aspects of the catalytic Fischer-Tropsch Process
Applied Catalysis A: General, 1996Co-Authors: Mark E. DryAbstract:Abstract The development, current status as well as the future of the Fischer-Tropsch (FT) Process is reviewed. In this past decade, several new FT plants and reactors have been built. The first commercial scale slurry (3 phase) reactor and an improved version of the 2-phase fluidized bed reactor were successfully commissioned. The practical chemical, engineering and economic aspects of the FT Process and reactors as well as the means of controlling conversion and selectivity are discussed. Despite the uncertainties regarding the chemical mechanism and the rate controlling steps satisfactory kinetic equations have been developed and successfully applied in both the design and control of FT reactors. The various proposed mechanisms are reviewed and a new version is presented. Uncertainties remain, however, and the usefulness of the present mechanistic information is questioned.
Gary J. Stiegel - One of the best experts on this subject based on the ideXlab platform.
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Iron-based catalysts for slurry-phase Fischer-Tropsch Process: Technology review
Fuel Processing Technology, 1992Co-Authors: Gary J. Stiegel, G. Cinquegrane, R. D. SrivastavaAbstract:Abstract The slurry-phase reactor system is of interest in Fischer-Tropsch synthesis owing to the ability of the reactor system to efficiently remove the heat produced by the exothermic reaction. Iron-based catalysts are active for Fischer-Tropsch synthesis and for the water-gas shift reaction, and, in addition, are inexpensive. Hence, they have been examined in slurry-phase Fischer-Tropsch synthesis with CO-rich synthesis gas. The role of promoters, carbide phases, and oxide phases in iron-based catalysts is not well understood. The article reviews current knowledge of iron-based catalysts with reference to their application in slurry-phase Fischer-Tropsch synthesis. Areas of investigation requiring further research are identified.
Oliver R Inderwildi - One of the best experts on this subject based on the ideXlab platform.
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fischer tropsch mechanism revisited alternative pathways for the production of higher hydrocarbons from synthesis gas
Journal of Physical Chemistry C, 2008Co-Authors: Oliver R Inderwildi, Stephen J Jenkins, David A KingAbstract:Evidence from density functional theory calculations that the main reaction pathway for the Fischer−Tropsch Process on Co{0001} is not the carbide mechanism but an alternative branch starting with the hydrogenation of CO to an oxymethylidyne species. We show that hydrogenation is the main reaction path at realistic pressure using microkinetic simulations and thereby bridge the pressure gap in heterogeneous catalysis.
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Fischer−Tropsch Mechanism Revisited: Alternative Pathways for the Production of Higher Hydrocarbons from Synthesis Gas
The Journal of Physical Chemistry C, 2008Co-Authors: Oliver R Inderwildi, Stephen J Jenkins, David A KingAbstract:Evidence from density functional theory calculations that the main reaction pathway for the Fischer−Tropsch Process on Co{0001} is not the carbide mechanism but an alternative branch starting with the hydrogenation of CO to an oxymethylidyne species. We show that hydrogenation is the main reaction path at realistic pressure using microkinetic simulations and thereby bridge the pressure gap in heterogeneous catalysis.