Fischer–Tropsch synthesis: support, loading, and promoter effects on the reducibility of cobalt catalysts

Jacobs, Gary; Das, Tapan K.; Zhang, Yongqing; Li, Jinlin; Racoillet, Guillaume; Davis, Burtron H.

doi:10.1016/s0926-860x(02)00195-3

Cited by 795 publications

(544 citation statements)

References 13 publications

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“…Briefly, in an inert atmosphere a carbonyl precursor, Co 2 (CO) 8 , was decomposed in 1,2-dichlorobenzene at a temperature near its boiling point (~182ºC) [23,24]. Rapid injection of organometallic reagents in the hot solvent produces discrete and homogeneous nucleation sites.…”

Section: Methodsmentioning

confidence: 99%

Influence of the Cobalt Particle Size in the CO Hydrogenation Reaction Studied by In Situ X-Ray Absorption Spectroscopy

et al. 2009

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TitleInfluence of the cobalt particle size in the CO hydrogenation reaction studied by in situ X-ray absorption spectroscopy To whom correspondence should be addressed. E-mail: MBSalmeron@lbl.govThe influence of particle size in the carbon monoxide hydrogenation reaction has been studied using cobalt nanoparticles (NP) with narrow size distribution prepared by colloidal chemistry. The surfactant covering the NP after synthesis could be removed by heating to 200-270ºC in H 2 . Soft X ray absorption spectroscopy was performed in a gas flow cell under reaction conditions of H 2 and CO at atmospheric pressure. Flow of pure hydrogen at 350ºC removed the protecting surfactant layer and reduced the NP from oxidized to metallic. The NP remained metallic during the methanation reaction with their surface covered by CO. The methanation turnover frequency of silica supported NP was found to decrease with diameter below 10 nm, while the reaction activation energy was found to be independent of NP size. H-D exchange experiments indicated that it is the dissociation of H 2 that is responsible for the observed decrease in activity with size.2 KEYWORDS. Cobalt, nanoparticles, Fischer-Tropsch, X-ray absorption (XAS), in situ studies, soft xray spectroscopy, particle size dependence.

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Section: Methodsmentioning

confidence: 99%

Influence of the Cobalt Particle Size in the CO Hydrogenation Reaction Studied by In Situ X-Ray Absorption Spectroscopy

et al. 2009

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“…Ru is the most studied noble metal promoter and it has been frequently showed to play a role both in structural and electronic promotion. 146,149,155,157,[160][161][162][163][164][165][166][167][168]170,174,176,177,254,260 In the early nineties, Turney et al observed that the addition of Ru to Co/CeO 2 catalysts drastically increased the Co F-T activity without modifying the catalyst selectivity. 44,45 Results obtained from XPS and TPR indicated that Ru caused a decrease of the reduction temperature of supported Co 3 O 4 nanoparticles.…”

Section: Overview Of the Promoter Elements Used Inmentioning

confidence: 99%

Promotion Effects in Co‐Based Fischer—Tropsch Catalysis

Morales¹,

Weckhuysen²

2006

ChemInform

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“…On one hand, strong interaction between the metallic phase and the support has been observed to improve catalytic activity [17], but on the other hand, it may be detrimental due to the formation of irreducible metal-support compounds such as cobalt aluminate or cobalt silicate by way of incorporating CoO into the Al 2 O 3 or SiO 2 support respectively [18], thereby leading to catalyst deactivation. In addition, carburization of the Co catalyst may lead to deactivation since the cobalt carbide (Co 2 C) formed is not a catalytically active material for FTS [4], though it has been observed to enhance the activity of the Fe-based catalyst [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of CO Concentration on the α-Value of Plasma-Synthesized Co/C Catalyst in Fischer-Tropsch Synthesis

Aluha

Abatzoglou

2017

Catalysts

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Abstract:A plasma-synthesized cobalt catalyst supported on carbon (Co/C) was tested for Fischer-Tropsch synthesis (FTS) in a 3-phase continuously-stirred tank slurry reactor (3-φ-CSTSR) operated isothermally at 220 • C (493 K), and 2 MPa pressure. Initial syngas feed stream of H 2 :CO ratio = 2 with molar composition of 0.6 L/L (60 vol %) H 2 and 0.3 L/L (30 vol %) CO, balanced in 0.1 L/L (10 vol %) Ar was used, flowing at hourly space velocity (GHSV) of 3600 cm 3 ·h −1 ·g −1 of catalyst. Similarly, other syngas feed compositions of H 2 :CO ratio = 1.5 and 1.0 were used. Results showed~40% CO conversion with early catalyst selectivity inclined towards formation of gasoline (C 4 -C 12 ) and diesel (C 13 -C 20 ) fractions. With prolonged time-on-stream (TOS), catalyst selectivity escalated towards the heavier molecular-weight fractions such as waxes (C 21+ ). The catalyst's α-value, which signifies the probability of the hydrocarbon-chain growth was empirically determined to be in the range of 0.85-0.87 (at H 2 :CO ratio = 2), demonstrating prevalence of the hydrocarbon-chain propagation, with particular predisposition for wax production. The inhibiting CO effect towards FTS was noted at molar H 2 :CO ratio of 1.0 and 1.5, giving only~10% and~20% CO conversion respectively, although with a high α-value of 0.93 in both cases, which showed predominant production of the heavier molecular weight fractions.

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Fischer–Tropsch synthesis: support, loading, and promoter effects on the reducibility of cobalt catalysts

Cited by 795 publications

References 13 publications

Influence of the Cobalt Particle Size in the CO Hydrogenation Reaction Studied by In Situ X-Ray Absorption Spectroscopy

Influence of the Cobalt Particle Size in the CO Hydrogenation Reaction Studied by In Situ X-Ray Absorption Spectroscopy

Promotion Effects in Co‐Based Fischer—Tropsch Catalysis

Effect of CO Concentration on the α-Value of Plasma-Synthesized Co/C Catalyst in Fischer-Tropsch Synthesis

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