Interplay of reaction and pore diffusion during cobalt-catalyzed Fischer–Tropsch synthesis with CO 2 -rich syngas

Pöhlmann, Ferdinand; Jess, Andreas

doi:10.1016/j.cattod.2015.09.032

Cited by 37 publications

(71 citation statements)

References 40 publications

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“…7 Finally, the solid was dried at room temperature and calcined in air at 360 °C for 3 h. Tab. The γ-Al 2 O 3 pellets (5 x 5 mm) were stirred in an aqueous solution of cobaltous nitrate hexahydrate and tetraamineplatinum(II) nitrate (900 ml H 2 O, 1 kg Co(NO 3 ) 2 ·6H 2 O, 2 g Pt(NH 3 ) 4 (NO 3 ) 2 ).…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…7,19 Nevertheless, a constant (mean) α value was assumed here over the entire course of reaction and pore filling, respectively. 7,19 Nevertheless, a constant (mean) α value was assumed here over the entire course of reaction and pore filling, respectively.…”

Section: Structure and Main Parameters Of The Model Of Pore Fillingmentioning

confidence: 99%

“…7,21 (vii) The hydrocarbon liquid phase in the pores represents an ideal mixture. not concentrated in the core).…”

Section: Structure and Main Parameters Of The Model Of Pore Fillingmentioning

confidence: 99%

“…only a couple of days. 7 Depending on reaction conditions, such as total pressure, H 2 /CO-ratio and temperature, a pore filling degree F significantly below 1 is observed. In case of internal mass transport limitations, the H 2 /COratio -and thus α -decreases towards the core of the catalyst particle (D H2,liq ≈ 2 D CO,liq ).…”

Section: Introductionmentioning

confidence: 98%

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Accumulation of liquid hydrocarbons in catalyst pores during cobalt-catalyzed Fischer–Tropsch synthesis

Pöhlmann

Kern

Rößler

et al. 2016

Catal. Sci. Technol.

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aIn the literature, it is widely claimed that during the initial period of Fischer-Tropsch synthesis liquid higher hydrocarbons fill catalyst pores completely, at least for temperatures of less than 250°C at a typical pressure of about 2 MPa. This leads to diffusional restrictions in the porous network for particles with a size for industrial fixed-bed operation (> 1 mm), whereby catalyst effectiveness and product selectivity are strongly affected. However, under industryally relevant reaction conditions, our experimental and theoretical investigations on the interplay of reaction and diffusion in cobalt catalyst particles reveal that the pores are only partly filled with liquid higher hydrocarbons even at a very long time on stream of months or more for a chain growth probability below about 0.8. Experiments were conducted in a magnetic suspension balance using particles of technical size (dp = 3 mm), and a mathematical model was developed describing quite accurately the formation, vaporization and accumulation of liquid products and their C-number distribution in the porous particle.

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Section: Catalyst Preparationmentioning

confidence: 99%

Section: Structure and Main Parameters Of The Model Of Pore Fillingmentioning

confidence: 99%

“…7,21 (vii) The hydrocarbon liquid phase in the pores represents an ideal mixture. not concentrated in the core).…”

Section: Structure and Main Parameters Of The Model Of Pore Fillingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Accumulation of liquid hydrocarbons in catalyst pores during cobalt-catalyzed Fischer–Tropsch synthesis

Pöhlmann

Kern

Rößler

et al. 2016

Catal. Sci. Technol.

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“…Fischer-Tropsch synthesis (FTS) is a commercial polymerization process used for conversion of hydrogen and carbon monoxide into a variety of sulfur and aromatics-free hydrocarbons having wide range of chain length and functionality [2]. Syngas, which is a mixture of hydrogen and carbon monoxide, can be prepared by the gasification of coal or biomass and steam reforming of methane [3,4].…”

Section: Introductionmentioning

confidence: 99%

Development of Hydrotalcite Based Cobalt Catalyst by Hydrothermal and Co-precipitation Method for Fischer-Tropsch Synthesis

Shareef

Arslan

Iqbal

et al. 2017

Bull. Chem. React. Eng. Catal.

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This paper presents the effect of a synthesis method for cobalt catalyst supported on hydrotalcite material for Fischer-Tropsch synthesis. The hydrotalcite supported cobalt (HT-Co) catalysts were synthesized by co-precipitation and hydrothermal method. The prepared catalysts were characterized by using various techniques like BET (Brunauer-Emmett-Teller), SEM (Scanning Electron Microscopy), TGA (Thermal Gravimetric Analysis), XRD (X-ray diffraction spectroscopy), and FTIR (Fourier Transform Infrared Spectroscopy). Fixed bed micro reactor was used to test the catalytic activity of prepared catalysts. The catalytic testing results demonstrated the performance of hydrotalcite based cobalt catalyst in Fischer-Tropsch synthesis with high selectivity for liquid products. The effect of synthesis method on the activity and selectivity of catalyst was also discussed.

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Mass transfer advantage of hierarchical structured cobalt‐based catalyst pellet for Fischer–Tropsch synthesis

Niu

Li²,

Xia

et al. 2021

AIChE Journal

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The low effectiveness factor of catalyst pellet caused by high internal diffusion limitation is a common issue in fixed-bed reactor. Nevertheless, hierarchical structured catalyst provides a promising solution for the contradiction between reaction activity and diffusion efficiency in large catalyst pellets. Herein, we studied the effect of pore structure parameters of the meso-macroporous catalyst on Fischer-Tropsch synthesis performances through experiment and pellet scale reaction-diffusion simulation.The pellet simulation firstly elucidated the reason for the significant improvement on activity and product selectivity for the meso-macroporous catalyst observed in our experiment. Further optimization via pellet simulation indicated the critical influences of wax filling degree and that the perfect matching between reaction and mass transfer rates by increasing macropore size and adjusting porosity within pellet enables the C 5+ space-time yield to the maximum. This work could provide a theoretical guideline for the engineering design of the hierarchical structured catalyst pellet.

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Interplay of reaction and pore diffusion during cobalt-catalyzed Fischer–Tropsch synthesis with CO 2 -rich syngas

Cited by 37 publications

References 40 publications

Accumulation of liquid hydrocarbons in catalyst pores during cobalt-catalyzed Fischer–Tropsch synthesis

Accumulation of liquid hydrocarbons in catalyst pores during cobalt-catalyzed Fischer–Tropsch synthesis

Development of Hydrotalcite Based Cobalt Catalyst by Hydrothermal and Co-precipitation Method for Fischer-Tropsch Synthesis

Mass transfer advantage of hierarchical structured cobalt‐based catalyst pellet for Fischer–Tropsch synthesis

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