Novel synthesis route for egg-shell, egg-white and egg-yolk type of cobalt on silica catalysts

Zhuang, Youqi; Claeys, Michael; Steen, Eric van

doi:10.1016/j.apcata.2005.11.029

Cited by 34 publications

(23 citation statements)

References 15 publications

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“…lowering the methane selectivity, increasing the average molecular weight of the product, but the change in the olefin content and extent of double bond isomerization seems to be negligible. However, in Fe-Zn-Cu-K catalysts, an increase in the methane selectivity upon addition of copper was observed in the absence of potassium, but the effect was strongly diminished in the presence of potassium [183].…”

Section: Selectivity In the Fischer-tropsch Synthesismentioning

confidence: 79%

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Fischer‐Tropsch Catalysts for the Biomass‐to‐Liquid (BTL)‐Process

2008

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The Fischer-Tropsch synthesis is at the heart of the Biomass-to-Liquids (BTL) process. Feasibility studies published in open literature typically consider cobaltbased catalysts for the Fischer-Tropsch synthesis. Here, we present an overview on the history and development up until the present for both cobalt-and ironbased Fischer-Tropsch catalysts. The role of the support material and various other additives to the catalyst formulation are discussed in detail with regard to activity, catalyst deactivation, and selectivity. Tentative explanations for e.g. the observed size dependency in cobalt-based catalysts and phase transformations in iron-based Fischer-Tropsch catalysts are offered. The productivity of cobalt-based catalysts at high conversion level is currently higher than that of iron-based catalysts. Nevertheless, it is argued that iron-based catalysts may be an attractive option for the BTL-process, since it is much cheaper, impacting on the cost of the process due to inevitable process set-ups in industrial operation. Improvement of current iron-based catalysts is however desired.

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Section: Selectivity In the Fischer-tropsch Synthesismentioning

confidence: 79%

“…It has been argued (vide supra) that increasing the resulting crystallite size of iron carbide in the working catalyst may result in a larger fraction of iron being active. The resulting iron-based catalysts need to be adequately promoted, and values of 1 Cu/nm 2 and 2 K/nm 2 have been recommended [183].…”

Section: Discussion and Outlookmentioning

confidence: 99%

Fischer‐Tropsch Catalysts for the Biomass‐to‐Liquid (BTL)‐Process

2008

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“…For example, in the case of catalyst‐body‐supported catalysts, the spatial distribution of the active species is required for the end industrial application. Typically, the thickness of the active layer in catalyst bodies is in the range of tens of micrometers to several millimeters, which is significantly greater than the detection depth of SEM or TEM …”

Section: Introductionmentioning

confidence: 76%

3 D Imaging and Structural Analysis of a Mesoporous‐Silica‐Body‐Supported Eggshell Cobalt Catalyst for Fischer–Tropsch Synthesis

Han

Lin

et al. 2016

ChemCatChem

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For understanding the relationship between the structure and catalytic property and further optimizing the synthetic steps, it is imperative to obtain basic information about the characteristics of heterogeneous catalysts, such as porosity, dispersion, and accessibility of the active metal phases. Herein, we reported a multiscale analysis of an eggshell‐Co‐based catalyst for the Fischer–Tropsch synthesis (FTS), which was prepared by wetness impregnation. Conventional characterization techniques, such as mercury porosimetry, nitrogen physisorption, and transmission electron microscopy (TEM), were employed for obtaining basic information about the porosity and dispersion of cobalt on the nanoscale; in addition, phase‐contrast X‐ray computed microtomography (X‐ray μCT) as a powerful method was employed for obtaining vitally complementary information regarding the 3 D structure of a millimeter‐sized mesoporous silica support and a full‐field view of the macroscopic distribution of cobalt. The Co reduction behavior and FTS performance was correlated with the structure analyses, highlighting the importance of simultaneously controlling the dispersion and spatial distribution of Co ranging from macro to nanoscale.

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“…Pellets of a silica-supported Co 3 O 4 catalyst with a uniform distribution of Co 3 O 4 was prepared as described previously [12]. Cylindrical shaped silica pellets (Aerolyst 3038, Degussa; d pellet = 2.5 mm; h pellet = 4.5 mm; S BET = 270 m 2 /g; d pore = 12 nm) were contacted with an impregnation solution containing 0.55 g Co(NO 3 ) 2 Á6H 2 O in 1 ml deionised water.…”

Section: Methodsmentioning

confidence: 99%

Effective Utilization of the Catalytically Active Phase: NH3 Oxidation Over Unsupported and Supported Co3O4

2012

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The performance of pellets of unsupported and silica-supported Co 3 O 4 in the ammonia oxidation was investigated as a function of the particle size to investigate the utilization of the catalytically active phase in these materials. The obtained activity in terms of ammonia conversion over the silica-supported Co 3 O 4 is higher compared to the conversion over the unsupported Co 3 O 4 , despite a lower cobalt oxide loading and more severe diffusional limitations. The effectiveness factor for the silicasupported catalyst is slightly lower than the effectiveness factor for the unsupported catalyst in the form of pellets of similar size. However, the effective utilization of cobalt within the catalyst is higher for the silica-supported catalyst, mainly due to the higher dispersion of the catalytically active phase.

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Novel synthesis route for egg-shell, egg-white and egg-yolk type of cobalt on silica catalysts

Cited by 34 publications

References 15 publications

Fischer‐Tropsch Catalysts for the Biomass‐to‐Liquid (BTL)‐Process

Fischer‐Tropsch Catalysts for the Biomass‐to‐Liquid (BTL)‐Process

3 D Imaging and Structural Analysis of a Mesoporous‐Silica‐Body‐Supported Eggshell Cobalt Catalyst for Fischer–Tropsch Synthesis

Effective Utilization of the Catalytically Active Phase: NH3 Oxidation Over Unsupported and Supported Co3O4

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