The Fischer-Tropsch reaction on a cobalt (0001) single crystal

Geerlings, I. J. C.; Zonnevylle, M.C.; Groot, C.P.M. De

doi:10.1007/bf00764676

Cited by 28 publications

(21 citation statements)

References 9 publications

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“…[19,20] Geerlings et al conducted work on Co single crystals with different exposed crystal planes. [20][21][22] Under these reaction conditions methane is the major product, with lesser amounts of heavier hydrocarbons. [20][21][22] Under these reaction conditions methane is the major product, with lesser amounts of heavier hydrocarbons.…”

Section: Fischer-tropsch Synthesis On Single Crystal Surfacesmentioning

confidence: 99%

Surface Science Studies on Cobalt Fischer–Tropsch Catalysts

et al. 2010

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Fischer–Tropsch (FT) synthesis has received considerable recent attention from academic and industrial researchers. Cobalt catalysts exhibit excellent activity/selectivity for FT; however its relative cost is high. Therefore the design of enhanced Co catalysts is economically attractive. To achieve this goal, the fundamental processes occurring on the surface of cobalt catalysts need to be better understood. Surface science studies, with the aid of model catalysts, can provide such crucial information. Numerous review articles concerning the details of technical FT catalysts are available, however very few of these specifically address cobalt model catalysts. In this review, we briefly summarize the literature regarding FT synthesis on various cobalt model catalysts, ranging from well‐defined single crystals to nanoparticles dispersed on planar oxide supports. Fundamental issues such as structure sensitivity, surface restructuring, olefin readsorption, promoter effects, particle size effects, and the oxidation of nanoparticles are addressed.

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Section: Fischer-tropsch Synthesis On Single Crystal Surfacesmentioning

confidence: 99%

Surface Science Studies on Cobalt Fischer–Tropsch Catalysts

et al. 2010

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“…Such interactions decrease if recombination of CH x species occurs with x < 3. Table 2 summarizes activation energies of recombination reactions Chain growth will be favoured over methanation on metals that have a significant surface coverage of reactive carbon [22] with a long residence time for adsorbed CH x intermediates. This partially explains why metals with a relatively high dissociation energy of CO will produce a low surface coverage of reactive carbon.…”

Section: Carbon-carbon Bond Formationmentioning

confidence: 99%

“…Similarily on the more open Co surface, carbon atoms will be more strongly bonded than on the more dense surfaces. The open surfaces have been shown to have an increased propagation rate [22].…”

Section: Carbon-carbon Bond Formationmentioning

confidence: 99%

The quantum chemical basis of the Fischer-Tropsch reaction

1990

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Fischer-Tropsch synthesis, transition metal surfaces, CO and CH~ reactivity, electronic features in F-T synthesis, bond strength, activation energy, chemisorption, CO dissociation, extended Hiickel method, ASED method, quantum chemistry.The electronic features determining the reactivity of CO and CH x on transition metal surfaces are reviewed. Focus is on the relevant features that control the Fischer-Tropsch synthesis. The CO dissociation reaction path is controlled by the interaction with the CO bond strength weakening 2~r* orbitals. CH 3 fragment adsorption is controlled by o type molecule fragment orbitals. This directs the CH 3 fragment to the atop adsorption site on those late transition metals that have strongly interacting d-valence electrons. Adsorbed C and O have a stronger bond strength than CH 3 because they have also unoccupied atomic p orbitals available to bonding. Because the bond strength of adsorbed C and O increases more rapidly with depletion of d-valence electron occupation than that of CO, the activation energy for CO dissociation decreases for the corresponding transition metals towards the left of the periodic system. The rate of methanation versus chain growth is controlled by the strength of the M-CH 3 bond versus the activation energy of carbon-carbon bond formation. The first appears to be more sensitive to variations in metal carbon bond strength than the latter.

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“…Geerlings et al [11], conducted work on Co single crystals with different exposed crystal planes. In a recent paper, [12] the author compared the catalytic performance between Co single crystals and the supported catalysts with Co single crystals. Cobalt based catalysts were prepared with carrying the cobalt on inorganic supports such as SiO 2 [13,14], and Al 2 O 3 [15].…”

Section: /[598]mentioning

confidence: 99%

Synthesis of Cobalt–Based Catalyst Supported on TiO₂ Nanotubes and its Fischer–Tropsch Reaction

Zhi

et al. 2013

Integrated Ferroelectrics

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The cobalt-based Fischer-Tropsch (F-T) catalysts, in which Co 3 O 4 nanocrystals, supported on TiO 2 nanotubes were prepared and charactered. The structure of the catalysts was characterized by X-ray diffraction, Transmission electron microscope and energy-dispersive X-ray spectroscopy. And the catalytic activity in F-T reaction was also investigated. In the CO hydrogenation reaction, the cobalt species dispersed on the TiO 2 nanotubes have higher selectivity and activity compare to sample in which Co 3 O 4 nanocrystals supported on TiO 2 bulk materials. According to the data of product selectivity, it can be concluded that cobalt-based F-T catalysts had higher selectivity and activity.

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The Fischer-Tropsch reaction on a cobalt (0001) single crystal

Cited by 28 publications

References 9 publications

Surface Science Studies on Cobalt Fischer–Tropsch Catalysts

Surface Science Studies on Cobalt Fischer–Tropsch Catalysts

The quantum chemical basis of the Fischer-Tropsch reaction

Synthesis of Cobalt–Based Catalyst Supported on TiO₂ Nanotubes and its Fischer–Tropsch Reaction

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The Fischer-Tropsch reaction on a cobalt (0001) single crystal

Cited by 28 publications

References 9 publications

Surface Science Studies on Cobalt Fischer–Tropsch Catalysts

Surface Science Studies on Cobalt Fischer–Tropsch Catalysts

The quantum chemical basis of the Fischer-Tropsch reaction

Synthesis of Cobalt–Based Catalyst Supported on TiO2 Nanotubes and its Fischer–Tropsch Reaction

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Synthesis of Cobalt–Based Catalyst Supported on TiO₂ Nanotubes and its Fischer–Tropsch Reaction