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Fischer-Tropsch Synthesis on Fe-Co-Pt/γ-Al2O3 catalyst: A mass transfer, kinetic and mechanistic study

  • Catalysis, Reaction Engineering
  • Published:
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Abstract

Mass transfer limitations and kinetics studies were performed for Fischer-Tropsch Synthesis over spherical 10wt% Fe-10wt% Co-0.5wt% Pt/79.5wt% γ-Al2O3 catalyst in a fixed bed reactor. The external mass transfer limitation was checked by studying the effect of gas hourly space velocity (GHSV) and feed flow rate (at constant GHSV) on CO conversion. Theoretical and practical methods were applied to assess the effect of catalyst pellet size on the internal mass transfer limitation. The results indicated there is external diffusion limitation for GHSV lower than 4,200 h−1. Both the theoretical and practical methods showed that the reaction is free of internal diffusion limitation with average particle sizes of 0.21 and 0.42 mm due to Thiele modulus smaller than 0.4, denoting that the rate of reaction is kinetically controlled. The kinetics results demonstrated the combined enol and carbide mechanism-based model was able to provide a good fit for the experimental data.

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Abbreviations

bCO :

adsorption coefficient of CO

\({{\rm{b}}_{{H_2}}}\) :

adsorption coefficient of H2

C n−1As :

concentration at the external surface of the catalyst pellet

C WP :

Weisz-Prater criterion

C V :

concentration of free active sites

DA :

bulk diffusivity [m2·min−1]

Deff :

effective diffusivity [m2·s−1]

D K :

Knudsen diffusivity [cm2·s−1]

dP :

pellet diameter [mm]

Ea :

activation energy [kJ·mol−1]

ER:

Eley-Rideal

FTS:

Fischer-Tropsch Synthesis

F 0CO :

molar flow rate of CO at the inlet [mol·min−1]

GHSV:

gas hourly space velocity [h−1]

HMTA:

hexamethylene tetramine

IUPAC:

international union of pure and applied chemistry

i* :

adsorbed i species on the vacant active site

k:

reaction rate constant [mol·g−1·min−1]

k ads,CO :

rate constant of adsorption of CO

\({{\rm{k}}_{ads,{H_2}}}\) :

rate constant of adsorption of H2

k des,CO :

rate constant of desorption of CO

\({{\rm{k}}_{des,\,{H_2}}}\) :

rate constant of desorption of H2

LHHW:

Langmuir-Hinshelwood-Hougen-Watson

LP :

shape factor

MARR:

mean absolute relative residual

n:

reaction order

N exp :

number of experiments

PCO :

CO partial pressure [bar]

\({{\rm{P}}_{{H_2}}}\) :

hydrogen partial pressure [bar]

R:

universal gas constant 8.314 [J·mol−1·K−1]

R2 :

coefficient of determination

−rCO :

consumption rate of CO [mol·g −1cat ·min−1]

rintrinsic :

reaction rate in the absence of mass transfer limitations

robserved :

observed reaction rate

RP :

pellet radius [mm]

RDS:

rate determining step

Wcat :

catalystweight [g]

X CO :

CO conversion

ΔH:

heat of adsorption [kJ·mol−1]

ε :

pellet porosity

ϕ :

thiele modulus

η :

effectiveness factor

τ :

tortuosity

ψ CO :

surface occupied with CO

ψ H :

surface occupied with H

ε COH :

surface occupied with COH

σ :

mean of values of experimental rate

*:

unoccupied active sites

Exp:

experimental value

mod:

predicted value

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Acknowledgements

The authors gratefully appreciate University of Sistan and Baluchestan for helping and supporting this research.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, 98135-674, Iran

    Amir Eshraghi & Ali Akbar Mirzaei

  2. Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, P. O. Box 98164-161, Zahedan, Iran

    Rahbar Rahimi & Hossein Atashi

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  1. Amir Eshraghi
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Eshraghi, A., Mirzaei, A.A., Rahimi, R. et al. Fischer-Tropsch Synthesis on Fe-Co-Pt/γ-Al2O3 catalyst: A mass transfer, kinetic and mechanistic study. Korean J. Chem. Eng. 37, 1699–1708 (2020). https://doi.org/10.1007/s11814-020-0590-6

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  • DOI: https://doi.org/10.1007/s11814-020-0590-6

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