2021
DOI: 10.1021/acs.iecr.1c01940
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Effect of Silica Encapsulation on Cobalt-Based Catalysts for Fischer–Tropsch Synthesis under Different Reaction Conditions

Abstract: Cobalt nanoparticles prepared by a solvothermal treatment were encapsulated in silica with different shell thicknesses by the Stöber method. The application of these materials as catalysts in Fischer–Tropsch synthesis was investigated under different reaction conditions, and their behaviors were compared to a silica-supported cobalt catalyst. The protective effect displayed by the silica shell avoided sintering of the active phase and influenced the reaction selectivity and activity in comparison with the sup… Show more

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Cited by 7 publications
(11 citation statements)
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“…Based on the previous remarks, the present work presents a phenomenological model that describes the FTS reactions according to a living addition polymerization mechanism and focuses on the pseudospecies propagation steps. Much more than deviations, experimentally observed product distributions obtained with the catalyst system Co/SiO 2 27,39 are clearly narrower than predicted by the ASF model and somewhat similar to the Poisson distribution. On the face of that, the FTS reaction mechanism was revisited and described in accordance with a quasi-living polymerization scheme.…”
Section: ■ Introductionmentioning
confidence: 63%
See 1 more Smart Citation
“…Based on the previous remarks, the present work presents a phenomenological model that describes the FTS reactions according to a living addition polymerization mechanism and focuses on the pseudospecies propagation steps. Much more than deviations, experimentally observed product distributions obtained with the catalyst system Co/SiO 2 27,39 are clearly narrower than predicted by the ASF model and somewhat similar to the Poisson distribution. On the face of that, the FTS reaction mechanism was revisited and described in accordance with a quasi-living polymerization scheme.…”
Section: ■ Introductionmentioning
confidence: 63%
“…Additionally, some recent investigations reported selectivity results that deviate considerably from the ASF distribution. 27,28 Fortsch et al 21 reviewed the likely origins of the commonest ideal-ASF deviations and developed an extended ASF model, more robust and with five parameters. However, one should always be concerned with overparameterized models.…”
Section: ■ Introductionmentioning
confidence: 99%
“…8 To effectively address these issues, metal oxides such as SiO 2 (ref. [9][10][11] and Al 2 O 3 (ref. 12 and 13) have been widely employed as structural promoters, which can facilitate iron species dispersion and catalytic stability by suppressing the aggregation of iron species that endanger bulk Fe-based catalysts during FT synthesis.…”
Section: Introductionmentioning
confidence: 99%
“…It is known that supports are usually employed as an efficient way to improve the dispersion of active metal and strengthen the structural stability, and thus can efficiently improve catalytic performance. 6,7 Especially, SiO 2 as a support has been extensively studied and used to enhance the dispersion of active phases during FTS reaction, and thus inhibiting the agglomeration of the active phase and improving the catalytic performance of the catalyst. [8][9][10] However, it is inevitable that a strong interaction is formed between active metal and SiO 2 support that inhibits the reduction and carburization of active metal oxides, thus resulting in a lower catalytic activity.…”
Section: Introductionmentioning
confidence: 99%
“…Attributed to their low activity, undesired selectivity and poor stability, Fe‐based catalysts in the absence of promoters and supports are not suitable for FTS reaction. It is known that supports are usually employed as an efficient way to improve the dispersion of active metal and strengthen the structural stability, and thus can efficiently improve catalytic performance 6,7 . Especially, SiO 2 as a support has been extensively studied and used to enhance the dispersion of active phases during FTS reaction, and thus inhibiting the agglomeration of the active phase and improving the catalytic performance of the catalyst 8‐10 .…”
Section: Introductionmentioning
confidence: 99%