Fe:CoTiO2 bimetallic catalysts for the Fischer-Tropsch reaction I. Characterization and reactor studies

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

doi:10.1016/s0926-860x(96)00326-2

Cited by 119 publications

(59 citation statements)

References 46 publications

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“…Duvenhage's group have also reported a decrease in the overall activity of CoFe/TiO 2 bimetallic systems compared to that of pure Co/TiO 2 . 30 The CO conversion using 10%( 50 Fe 50 Co)TiO 2 was less than half that obtained with 10%Co/TiO 2 , but higher than that of 10%Fe/TiO 2 . The increase in iron content shifted the products to lower hydrocarbons, LPG and petrol fractions.…”

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confidence: 84%

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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confidence: 84%

Bimetallic catalysts for the Fischer–Tropsch reaction

et al. 2011

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“…[47,48] Other alloys that have been reported on Fe-Co systemsi nclude Fe 2 Co, Co 7 Fe 3 and Co/Fe supported on CaCO 3 ,S iO 2 and TiO 2 ,r espectively. [11,[49][50][51] It appearst hat the nature of the support materialu sed could influence the exact structure of the resultant alloy.T ot he best of our knowledge, there have been no literature reports on the in situ characterisation of Fe-Co systems supportedo nc arbons. Studies have been limitedt ot he PXRD characterisation of samples that were reduced ex situ at elevated temperatures.…”

Section: Catalyst Characterisationmentioning

confidence: 99%

“…Several studies have shown that bimetallic Fe-Co systems do not possessa dditive properties related to the constituent monometallic Fe or Co catalysts, but have unique characteristics. [5,[10][11][12][13] Tavasoli et al observed increased alcohol selectivity from bimetallic Fe-Co/carbon nanotubes (CNTs) catalystsc ompared to that of monometallic Co or Fe, which wasa ttributed to the formationo faC o-Fe alloy. [10] Duvenhage and Covillei nvestigated the effect of the metal precursor used to prepare supported bimetallic catalysts and compared metal nitrates with metal carbonyl complexes as precursors.…”

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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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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“…However, a major drawback of the process is the low selectivities for gasoline and diesel products. It has been reported that bimetallic catalysts containing Ni, Fe, Co and Ru are more active towards CO conversion, and exhibit markedly improved selectivity for olefins and heavier hydrocarbons as compared to single metal catalysts [2][3][4][5][6][7]. A large number of combinations of bimetallic catalysts are possible from the above four metals by varying the supports such as silica, alumina, titania, zirconia, zeolites, etc.…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that the bimetallic catalysts containing Ni, Fe, Co and Ru are more active towards CO conversion and exhibit markedly improved selectivity for olefins and heavier hydrocarbons as compared with single metal catalysts [2][3][4][5][6][7]. Verma et al [3] studied the performance of MnO supported Co, Ni and Co-Ni bimetallic catalysts at 525-575 K and at atmospheric pressure.…”

Section: Introductionmentioning

confidence: 99%

Carbon Monoxide Hydrogenation over Zirconia Supported Ni and Co-Ni Bimetallic Catalysts

Das¹,

Pradhan

Dalai³

et al. 2004

Catalysis Letters

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Zirconia supported nickel and cobalt-nickel bimetallic catalysts were prepared and characterized for various physico-chemical properties. The hydrogenation of carbon monoxide was studied over these catalysts in the pressure range of 101.3-1654 kPa, temperature range of 513-533 K, weight hourly space velocity range of 8-14 h À1 and H2/CO mole ratio of 2. Catalysts containing both Co and Ni were found to give higher C 5þ hydrocarbons selectivity compared to that containing only Ni. A maximum C 5þ hydrocarbons selectivity of 55 wt% was obtained at 655 kPa pressure, 523 K and 9.6 h À1 of WHSV with catalyst containing 4.03 wt% Co and 2.64 wt% Ni. The C 2 and C 3 olefin contents of the products decreased with increase in pressure. Improved deactivation behavior of the catalysts was observed when operated at high pressure.

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Fe:CoTiO2 bimetallic catalysts for the Fischer-Tropsch reaction I. Characterization and reactor studies

Cited by 119 publications

References 46 publications

Bimetallic catalysts for the Fischer–Tropsch reaction

Bimetallic catalysts for the Fischer–Tropsch reaction

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

Carbon Monoxide Hydrogenation over Zirconia Supported Ni and Co-Ni Bimetallic Catalysts

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