Calcination of Co-Based Fischer–Tropsch Synthesis Catalysts

Loosdrecht, J. van de; Barradas, S.; Caricato, E.A.; Ngwenya, Nonhlanhla; Nkwanyana, P.S.; Rawat, Maitreyee; Sigwebela, B.H.; Berge, P.J. van; Visagie, J. L.

doi:10.1023/b:toca.0000012992.97670.0a

Cited by 90 publications

(62 citation statements)

References 6 publications

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“…Thus, in order to maximise the cobalt dispersion, it is necessary to remove the cobalt precursor decomposition products efficiently. Figure 3(b) agrees with van de Loosdrecht et al [2] who found a positive correlation between the air flow rate during calcination and the cobalt metal surface area. At high flow rates, van de Loosdrecht et al [2] stated that the water and NO x concentrations were low.…”

Section: Hydrogen Chemisorptionsupporting

confidence: 89%

“…According to Reinalda and Kars [1], the activity and selectivity to long-chain hydrocarbons may be improved, if during calcination, the catalyst is exposed to an atmosphere containing large amounts of nitrogen oxides. In contrast, van de Loosdrecht et al [2] recorded high cobalt metal surface areas and high catalytic activities when the concentration of nitrogen oxides and water was kept low during calcination.…”

Section: Introductionmentioning

confidence: 90%

“…The conditions during calcination of impregnated cobalt precursors have a significant influence on the performance of the final catalyst [1,2]. According to Reinalda and Kars [1], the activity and selectivity to long-chain hydrocarbons may be improved, if during calcination, the catalyst is exposed to an atmosphere containing large amounts of nitrogen oxides.…”

Section: Introductionmentioning

confidence: 99%

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Effect of calcination atmosphere and temperature on γ-Al2O3 supported cobalt Fischer-Tropsch catalysts

et al. 2007

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The effect of calcination temperature and atmosphere on the properties of c-Al 2 O 3 supported cobalt Fischer-Tropsch catalysts has been investigated. One common precursor for all the catalysts was prepared by incipient wetness impregnation of c-Al 2 O 3 with an aqueous solution of cobalt nitrate hexahydrate. It was subjected to four different calcination atmospheres (air/50% steam: 30 mL/min, air: 30 mL/min, air: 50 mL/min, N 2 : 30 mL/min) and eight different calcination temperatures (range: 473-723 K), making the total number of samples 32. Both the post calcination nitrogen content and the cobalt dispersion were measured. The results demonstrated that in order to maximise the cobalt dispersion, it is necessary to use low calcination temperatures and remove the precursor decomposition products (NO, NO 2 , H 2 O) efficiently. The Fischer-Tropsch synthesis performance of two catalysts calcined at the same temperature, but at different air flow rates was evaluated. No significant effect of the air flow rate was found on the turnover frequency or C 5+ selectivity, but a high flow rate resulted in 30% higher activity per gram catalyst.

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Section: Hydrogen Chemisorptionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Effect of calcination atmosphere and temperature on γ-Al2O3 supported cobalt Fischer-Tropsch catalysts

et al. 2007

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“…Analysis of the available literature suggests that decomposition of cobalt precursor at milder conditions generally leads to higher cobalt dispersion. The suggestion about positive effect of slower decomposition of cobalt precursor on cobalt dispersion and catalytic performance is consistent with the earlier data of Van de Loosdrecht [20] et al who observed the beneficial effect of slower temperature ramping rate and higher space velocity during calcination on cobalt dispersion and number of active sites. De Jong [21,22] et al used NO/He mixture to decompose metal nitrate in cobalt and nickel supported catalysts.…”

Section: Decomposition Of Cobalt Precursor a Key To Better Cobalt DIsupporting

confidence: 81%

Enhancing cobalt dispersion in supported Fischer-Tropsch catalysts via controlled decomposition of cobalt precursors

Khodakov¹

2009

Braz. J. Phys.

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Fischer-Tropsch synthesis is a part of Gas-to Liquids (GTL), Biomass-to-Liquids (BTL) and Coal to Liquids (CTL) technologies, which produce alternatives clean fuels from natural gas, biomass and coal. The catalytic performance of cobalt catalysts in Fischer-Tropsch synthesis strongly depends on the size of cobalt particles in nanoscale range (6-30 nm). Cobalt catalysts are usually prepared via incipient wetness impregnation using cobalt salts (cobalt precursors). Catalyst preparation involves several important steps. The paper shows that decomposition of cobalt precursors is often a crucial step in the catalyst design; slower rate of decomposition of cobalt precursors favors smaller size of cobalt particles, higher cobalt dispersion and enhances catalytic performance in Fischer-Tropsch synthesis.

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“…The reduction peak at higher temperature ([500°C) was attributed to the reduction of interaction compound [16]. For CS, the reduction peak at 194°C was likely attributed either to the [17,18]. The preparation methods of TiO 2 -SiO 2 supports markedly affected the reduction processes of catalysts.…”

Section: Surface Propertiesmentioning

confidence: 96%

Influence of Support Preparation Methods on Structure and Catalytic Activity of Co/TiO2-SiO2 for Fischer–Tropsch Synthesis

Hou

et al. 2009

Catal Lett

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TiO 2 -SiO 2 supports were prepared by various methods including precipitation, impregnation, hydrolysisreflux and sol-gel, and then cobalt was impregnated on those supports. The properties of various catalysts were characterized by N 2 physisorption, XRD, XPS and TPR. The introduction of TiO 2 led to stronger Co-support interaction, accompanying with the variation of dispersion and reduction degree of cobalt. The catalytic test for F-T synthesis revealed that the addition of TiO 2 improved the performance of catalysts prepared by precipitation, impregnation and hydrolysis-reflux, but had a negative effect with sol-gel method.

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Calcination of Co-Based Fischer–Tropsch Synthesis Catalysts

Cited by 90 publications

References 6 publications

Effect of calcination atmosphere and temperature on γ-Al2O3 supported cobalt Fischer-Tropsch catalysts

Effect of calcination atmosphere and temperature on γ-Al2O3 supported cobalt Fischer-Tropsch catalysts

Enhancing cobalt dispersion in supported Fischer-Tropsch catalysts via controlled decomposition of cobalt precursors

Influence of Support Preparation Methods on Structure and Catalytic Activity of Co/TiO2-SiO2 for Fischer–Tropsch Synthesis

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