CO and CO2 hydrogenation study on supported cobalt Fischer–Tropsch synthesis catalysts

Zhang, Yongqing; Jacobs, Gary; Sparks, Dennis E.; Dry, Mark E.; Davis, Burtron H.

doi:10.1016/s0920-5861(01)00468-0

Cited by 191 publications

(119 citation statements)

References 14 publications

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“…It is curious that even higher C n products were not observed, but these photoreactions were conducted at temperatures in excess of 300°C, which may well be too high for good operation. Oddly enough, cobalt-based catalysts yield primarily methane during the hydrogenation of CO 2 (55,56). It was also shown that the increased water partial pressure stabilized the catalyst and it may be that the even higher P H2O is influencing the SPARC product distribution here.…”

Section: See Retraction Published January 8 2018mentioning

confidence: 90%

“…In a gas-phase model, the protons must migrate over the surface of the TiO 2 to the cobalt islands, leading to questions about the degree of surface hydration. It is notable that in the hydrogenation of CO or CO 2 on cobalt metal, several common surface-bound intermediates are invoked, even though the former gives hydrocarbon chains and the latter gives methane (55,56).…”

Section: See Retraction Published January 8 2018mentioning

confidence: 99%

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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: See Retraction Published January 8 2018mentioning

confidence: 90%

Section: See Retraction Published January 8 2018mentioning

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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“…11 Promoters typically utilised with cobalt Fischer-Tropsch catalysts such as platinum and palladium have little effect on the product distribution when CO2 is utilised as the carbon source. 12 Recent work conducted within our group has shown that addition of molybdenum and sodium as promoters to cobalt enhances the selective production of C2+…”

Section: 10mentioning

confidence: 99%

Effect of support of Co-Na-Mo catalysts on the direct conversion of CO2 to hydrocarbons

Owen

Pluciński

Mattia

et al. 2016

Journal of CO2 Utilization

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This study of the effect of support of Co-Na-Mo based catalysts on the direct hydrogenation of CO2 into hydrocarbons (HC) provides guidelines for the design of catalysts for CO2 conversion.We demonstrate that the surface area of the support and the metal-support interaction have a key role determining the cobalt crystallite size and consequently the activity of the system. Cobalt particles with sizes < 2 nm supported on MgO present low reverse water gas shift conversion with negligible Fischer-Tropsch activity. Increasing the cobalt particle size to ~ 15 nm supported on SiO2 and ZSM-5 supports not only substantially increases the CO2 conversion but it also provides high HC selectivities. Further increase of the cobalt particle size to 25-30 nm has a detrimental effect on the global CO2 conversion with HC:CO ratios below 1, however, lower methane selectivity and enhanced formation of unsaturated HC products are achieved. Additionally, the metal-support interaction potentially also has a strong effect on the growth chain probability of the formed hydrocarbons, increasing as the metal-support interaction increases. These evidences demonstrate that CO2 conversion and hydrocarbon distribution can be tuned towards desired products by controlled catalyst design.2

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“…The CO product can be used as feedstock in the Fischer-Tropsch process, a well-known and well-characterized process that has been used in industry to produce chemicals and synthetic fuels from syngas (CO þ H 2 ) for many decades 21 . By coupling the catalytic reduction of CO 2 to CO with the FischerTropsch process to produce synthetic fuels and industrial chemicals, the estimated maximum reduction of atmospheric CO 2 emissions is 40% (ref.…”

mentioning

confidence: 99%

A selective and efficient electrocatalyst for carbon dioxide reduction

et al. 2014

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Converting carbon dioxide to useful chemicals in a selective and efficient manner remains a major challenge in renewable and sustainable energy research. Silver is an interesting electrocatalyst owing to its capability of converting carbon dioxide to carbon monoxide selectively at room temperature; however, the traditional polycrystalline silver electrocatalyst requires a large overpotential. Here we report a nanoporous silver electrocatalyst that is able to electrochemically reduce carbon dioxide to carbon monoxide with approximately 92% selectivity at a rate (that is, current) over 3,000 times higher than its polycrystalline counterpart under moderate overpotentials of o0.50 V. The high activity is a result of a large electrochemical surface area (approximately 150 times larger) and intrinsically high activity (approximately 20 times higher) compared with polycrystalline silver. The intrinsically higher activity may be due to the greater stabilization of CO 2 À intermediates on the highly curved surface, resulting in smaller overpotentials needed to overcome the thermodynamic barrier.

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CO and CO2 hydrogenation study on supported cobalt Fischer–Tropsch synthesis catalysts

Cited by 191 publications

References 14 publications

RETRACTED: Solar photothermochemical alkane reverse combustion

RETRACTED: Solar photothermochemical alkane reverse combustion

Effect of support of Co-Na-Mo catalysts on the direct conversion of CO2 to hydrocarbons

A selective and efficient electrocatalyst for carbon dioxide reduction

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