Fe:Co/TiO2 bimetallic catalysts for the Fischer–Tropsch reaction

Duvenhage, D.J.; Coville, Neil J.

doi:10.1016/j.molcata.2005.04.029

Cited by 24 publications

(16 citation statements)

References 40 publications

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“…This could suggestt hat the alloy adoptsacore-shell-type structuret hat has ah igher Fe content in the shell. [13,14] The relative abundances of the Co-Fe alloy in the reduced bimetallic samples after in situ PXRD experiments were estimated using Rietveld refinement ( Table 2). The relative abundance of the alloy in the samples was noted to increasea st he Fe/Co ratio approached 5:5.…”

Section: Catalyst Characterisationmentioning

confidence: 99%

“…Both Fe-Co/TiO 2 systemsh ad similar activities in FT synthesis, but superior olefin selectivity and WGS activity was observed with the catalysts from the carbonyl systems. [14] More recently,X -ray absorption spectroscopy (X-ray absorption near edge structure, extended X-ray absorption fine structure), X-ray photoelectron spectroscopy andi nsitu powder X-ray diffraction (PXRD) using synchrotron radiation were used to illustrate the formation of Fe-Co speciesinF e-Co/Al 2 O 3 systems. [5] The performance of Fe-Co systemsh as been shown to depend on the type of support material used.…”

Section: Introductionmentioning

confidence: 99%

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Carbon Spheres Prepared by Hydrothermal Synthesis—A Support for Bimetallic Iron Cobalt Fischer–Tropsch Catalysts

et al. 2015

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Carbon spheres (CSs) synthesised by the hydrothermal approach were explored as a model support material for a bimetallic Fe–Co Fischer–Tropsch (FT) catalyst. The CSs were characterised by N2 adsorption–desorption, thermogravimetric analysis, FTIR spectroscopy and powder XRD. If annealed at 900 °C for 4 h, the CSs exhibited an improved surface area, thermal stability and crystallinity. A series of Fe–Co bimetallic FT catalysts supported on the annealed CSs were prepared by co‐precipitation. A variety of Fe‐to‐Co ratios were used with the total metal loadings maintained at 10 %. Catalyst reducibility studies were performed by H2 temperature‐programmed reduction and in situ powder XRD. Catalysts with a Fe/Co ratio of 5:5 (w/w) showed Co–Fe alloy formation upon reduction at >450 °C. Interestingly, the presence of this alloy did not correlate with high C5+ selectivities during FT synthesis; rather the Co‐rich/Fe‐poor catalyst gave the best selectivity. The CSs allowed the metal–metal interactions in the bimetallic systems to be monitored because of the weak interaction of the metals with the support.

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Section: Catalyst Characterisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carbon Spheres Prepared by Hydrothermal Synthesis—A Support for Bimetallic Iron Cobalt Fischer–Tropsch Catalysts

et al. 2015

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“…• C), a maximum selectivity was observed for C 6 , as well as a high olefin content (~95% in the C 3 -C 5 range). The selectivity for methane was 12.5%.…”

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confidence: 96%

“…Catalysts prepared from K 3 Fe(CN) 6 and Na 2 Fe(CN) 5 NO precursors exhibited a high activity and selectivity, whereas those prepared from K 4 Fe(CN) 6 were inactive. This lack of activity was attributed to the high potassium concentrations.…”

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confidence: 99%

Bimetallic catalysts for the Fischer–Tropsch reaction

et al. 2011

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This short critical review summarises and analyses the developments in Fischer-Tropsch catalysis using bimetallic alloys. We introduce a simple notation for such catalysts, and monitor the reports of synergistic effects and composition/performance relationships. Special attention is given to CoFe alloys on a variety of supports, and to the effects of catalyst preparation methods and pre-treatment conditions. The key drawbacks in comparing the large amount of data available on Fischer-Tropsch catalysis are the high dimensionality of the problem and the lack of long time-on-stream studies. Based on the new understanding coming from characterisation studies of supported bimetallic particles, we propose a structured approach for effectively studying Fischer-Tropsch catalysis.

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“…Among these catalysts, metal oxides catalysts, especially for cobalt oxides, are received special attention because of their unique properties, such as high oxidation efficiency, inexpensiveness and persistent activity. The studies [17][18][19][20][21][22][23] foused on cobalt catalysts had found that the presence of Co 3 O 4 means the high activity for oxidation reactions. Furthermore, it was reported [23] that the support, preparation technique and the pretreatment conditions had a strong function on the NO oxidation activity of cobalt oxides.…”

Section: Introductionmentioning

confidence: 99%

NO Catalytic Oxidation Behaviors over CoOx/TiO2 Catalysts Synthesized by Sol–Gel Method

Wang

et al. 2010

Catal Lett

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CoOx/TiO 2 catalysts synthesized by sol-gel method were investigated for the oxidation of NO to NO 2 in excess oxygen. NO oxidation efficiency increased sharply as oxygen concentration increased, while NO concentration showed a negative effect. Under the conditions of 30,000 h -1 GHSV, 600 ppm NO, 4% O 2 , 9% CoOx/TiO 2 (450) had the highest NO oxidation efficiency and reached the equilibrium at 300°C with a conversion of 79.8%. The XPS results determined that Co 3 O 4 was the main active phase in 9% CoOx/TiO 2 (450) prepared by sol-gel method.

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Fe:Co/TiO2 bimetallic catalysts for the Fischer–Tropsch reaction

Cited by 24 publications

References 40 publications

Carbon Spheres Prepared by Hydrothermal Synthesis—A Support for Bimetallic Iron Cobalt Fischer–Tropsch Catalysts

Carbon Spheres Prepared by Hydrothermal Synthesis—A Support for Bimetallic Iron Cobalt Fischer–Tropsch Catalysts

Bimetallic catalysts for the Fischer–Tropsch reaction

NO Catalytic Oxidation Behaviors over CoOx/TiO2 Catalysts Synthesized by Sol–Gel Method

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