Synthesis of cobalt–iron bimetallic nanocrystals supported on mesoporous silica using different templates

Bragança, L.F.F.P.G.; Avilez, Roberto R.; Silva, Maria Isabel Pais da

doi:10.1016/j.colsurfa.2010.01.025

Cited by 10 publications

(3 citation statements)

References 45 publications

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“…Cobalt is considered the most favorable metal for the synthesis of long chain hydrocarbons due to its high activity, high selectivity to linear paraffins and low water-gas shift (WGS) activity. The use of SBA-15 as a support for cobalt-based FTS catalyst has been recently studied by several researchers [5,6]. Noble metals such a Ru has been employed with Co-based catalysts to increase the reduction degree of cobalt.…”

Section: Introductionmentioning

confidence: 99%

“…Noble metals such a Ru has been employed with Co-based catalysts to increase the reduction degree of cobalt. Ruthenium is very attractive for catalytic processes FTS, however, has a high cost in comparison to catalysts of iron or cobalt and its quantity is limited in nature reserves, which makes industrial application difficult, being used only as a promoter at levels close 0.1% [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Molecular Sieve SBA-15 and Catalysts Co/SBA-15 and Ru/Co/SBA-15

Rodrigues

Lima

Paula

et al. 2014

MSF

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A series of mesoporous materials have been synthesized in an acid medium, with various structures, such as SBA-15. These materials have many properties which make them potential catalysts. Among these we highlight their high surface areas and pore walls relatively thick, resulting in a greater hydrothermal stability. This work aims at the synthesis and characterization of molecular sieve SBA-15 with molar composition: 1.0 TEOS: 0.017 P123: 5.7 HCl: 193 H2O and Co/SBA-15 and catalysts for the reaction of Ru/Co/SBA-15 Fischer Tropsch process. The materials were characterized by the techniques of X-ray diffraction (XRD), chemical analysis by X-ray spectrometry, energy dispersive (EDX) and Nitrogen adsorption (BET method). X-ray diffraction showed that the calcined cobalt catalyst did not modify the structure of SBA-15 and that Co was present under the form of Co3O4 in the catalyst. The addition of cobalt in the SBA-15 decreased the specific superficial area of the molecular sieve.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Molecular Sieve SBA-15 and Catalysts Co/SBA-15 and Ru/Co/SBA-15

Rodrigues

Lima

Paula

et al. 2014

MSF

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“…Olefin and alcohols are often produced at higher temperatures on an iron catalyst , . Although supported iron species typically exhibit a better catalytic activity, but the supports of iron catalysts have been limited to SiO 2 , TiO 2 and Al 2 O 3 , . As a FTS support, γ‐alumina is insensitive to the reaction temperature and imposes strong impact on catalytic performance of the resultant catalyst .…”

Section: Introductionmentioning

confidence: 99%

Deactivation Model for an Industrial γ‐Alumina Supported Iron Catalyst in the Fischer Tropsch Synthesis

et al. 2019

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In this research, deactivation model of an industrial γ‐alumina‐supported iron catalyst was investigated. Experiments were carried out in a fixed‐bed micro reactor over one‐time and four‐time impregnated catalysts at a reaction temperature of 250 °C, H2/CO ratio of 1, gas hourly space velocity (GHSV) of 3000 h−1, and reaction pressure of 2 bar. Neural networks strategy was used to predict the steady‐state catalytic activity for the ultimate purpose of determining the best deactivation model. Non‐linear regression and statistical analyses showed that the second‐order generalized power‐law equation (GPLE) could adequately described the deactivation behaviors of the considered catalysts. A comparison on the model parameters indicated higher deactivation rate of the four‐time impregnated catalyst, as compared to the one‐time one.

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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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Synthesis of cobalt–iron bimetallic nanocrystals supported on mesoporous silica using different templates

Cited by 10 publications

References 45 publications

Synthesis and Characterization of Molecular Sieve SBA-15 and Catalysts Co/SBA-15 and Ru/Co/SBA-15

Synthesis and Characterization of Molecular Sieve SBA-15 and Catalysts Co/SBA-15 and Ru/Co/SBA-15

Deactivation Model for an Industrial γ‐Alumina Supported Iron Catalyst in the Fischer Tropsch Synthesis

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

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