Advances in the Development of Novel Cobalt Fischer—Tropsch Catalysts for Synthesis of Long‐Chain Hydrocarbons and Clean Fuels

Khodakov, Andrei; Chu, Wei; Fongarland, Pascal

doi:10.1002/chin.200733255

Cited by 79 publications

(107 citation statements)

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“…These data reveal, to a first approximation, that the SPARC reaction responds to temperature and pressure in a manner similar to the FTS reaction and yields similar products. It is well-known that the FTS reaction responds to increases in pressure with an increase in productivity (gram product per gram catalyst per hour) and a shift in product distribution (selectivity) toward heavier hydrocarbons (40), and that the optimized industrial conditions are generally given around 20 atm, 220°C, with a 2:1 ratio of H 2 and CO for a cobalt-based catalyst (44,45). Because of this, we believe it is reasonable to assume some shared underlying chemical mechanisms and assume that higher pressures will shift the selectivity in SPARC chemistry to favor higher C n products.…”

Section: Resultsmentioning

confidence: 99%

RETRACTED: Solar photothermochemical alkane reverse combustion

Chanmanee

Islam

Dennis

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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A one-step, gas-phase photothermocatalytic process for the synthesis of hydrocarbons, including liquid alkanes, aromatics, and oxygenates, with carbon numbers (Cn) up to C13, from CO2 and water is demonstrated in a flow photoreactor operating at elevated temperatures (180–200 °C) and pressures (1–6 bar) using a 5% cobalt on TiO2 catalyst and under UV irradiation. A parametric study of temperature, pressure, and partial pressure ratio revealed that temperatures in excess of 160 °C are needed to obtain the higher Cn products in quantity and that the product distribution shifts toward higher Cn products with increasing pressure. In the best run so far, over 13% by mass of the products were C5+ hydrocarbons and some of these, i.e., octane, are drop-in replacements for existing liquid hydrocarbons fuels. Dioxygen was detected in yields ranging between 64% and 150%. In principle, this tandem photochemical–thermochemical process, fitted with a photocatalyst better matched to the solar spectrum, could provide a cheap and direct method to produce liquid hydrocarbons from CO2 and water via a solar process which uses concentrated sunlight for both photochemical excitation to generate high-energy intermediates and heat to drive important thermochemical carbon-chain-forming reactions.

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Section: Resultsmentioning

confidence: 99%

RETRACTED: Solar photothermochemical alkane reverse combustion

Chanmanee

Islam

Dennis

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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“…Fischer-Tropsch synthesis (FTS) is a key technology in heterogeneous catalysis for the production of chemicals including liquid fuel from carbon sources alternative to unsustainable crude oil [1][2][3][4] . The wide availability and resistance to poisons, high adaptability to broad H 2 /CO ratios and versatility to various useful products make iron-based catalysts ideal for converting H 2 -deficient syngas (CO and H 2 ) from coal and renewable biomass.…”

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confidence: 99%

ε-Iron carbide as a low-temperature Fischer–Tropsch synthesis catalyst

et al. 2014

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e-Iron carbide has been predicted to be promising for low-temperature Fischer-Tropsch synthesis (LTFTS) targeting liquid fuel production. However, directional carbidation of metallic iron to e-iron carbide is challenging due to kinetic hindrance. Here we show how rapidly quenched skeletal iron featuring nanocrystalline dimensions, low coordination number and an expanded lattice may solve this problem. We find that the carbidation of rapidly quenched skeletal iron occurs readily in situ during LTFTS at 423-473 K, giving an e-iron carbidedominant catalyst that exhibits superior activity to literature iron and cobalt catalysts, and comparable to more expensive noble ruthenium catalyst, coupled with high selectivity to liquid fuels and robustness without the aid of electronic or structural promoters. This finding may permit the development of an advanced energy-efficient and clean fuel-oriented FTS process on the basis of a cost-effective iron catalyst.

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“…The weights α and β of the superparamagnetic and singledomain particle distribution, correspondingly, can be found using a normalization condition and the condition of proportionality of volumes of two fractions of particles to their saturation magnetizations M s (1) and M s (2) : (21) where V 1 and V 2 are the volume of the corresponding fractions.…”

Section: Methods Of Magnetic Granulometrymentioning

confidence: 99%

F ischer‐ T ropsch Process

2006

Van Nostrand's Scientific Encyclopedia

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Résumé -La caractérisation par la méthode magnétique des catalyseurs Fischer-TropschCet article passe en revue les développements récents dans le domaine de la caractérisation des catalyseurs Fischer-Tropsch à base de cobalt, de fer et de nickel par la méthode magnétique. La caractérisation magnétique fournit des informations précieuses sur la réduction du catalyseur, la taille des nanoparticules ferromagnétiques, la chimisorption, ainsi que sur les réactions topochimiques qui se produisent avec les catalyseurs au cours de la genèse de la phase active et dans des conditions réactionnelles. Les possibilités et les limites de la méthode magnétique sont examinées. Abstract -Magnetic Characterization of Fischer-Tropsch Catalysts -This paper reviews recent developments in the application of magnetic methods for investigation of Fischer

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Advances in the Development of Novel Cobalt Fischer—Tropsch Catalysts for Synthesis of Long‐Chain Hydrocarbons and Clean Fuels

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Cited by 79 publications

References 1 publication

RETRACTED: Solar photothermochemical alkane reverse combustion

RETRACTED: Solar photothermochemical alkane reverse combustion

ε-Iron carbide as a low-temperature Fischer–Tropsch synthesis catalyst

F ischer‐ T ropsch Process

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