Jump to main content
Jump to site search

Issue 1, 2016
Previous Article Next Article

Enhancing internal mass transport in Fischer–Tropsch catalyst layers utilizing transport pores

Author affiliations

Abstract

Internal mass transport limitations inside Fischer–Tropsch catalysts due to the slow diffusion of reactants in the liquid-filled pores may significantly alter the selectivity and achievable productivity. In this work, diffusive restrictions for planar catalyst layers were investigated by mathematical modeling and simulation. A one-dimensional model utilizing empirical kinetics, incorporating transport pores as an additional pathway for mass transport and taking into account heat production, allows for calculation of catalyst efficiency and productivity towards C5+ products. As diffusional mass transport leads to strong concentration gradients that impair selectivity, an optimum layer thickness with maximum C5+ productivity can be found. Additional transport pores enhance the mass transport but reduce the amount of active phase, which requires a trade-off by optimizing the fraction of transport pores and layer thickness. For reference conditions, the catalyst layer with an ideal amount of transport pores and ideal thickness exhibits a productivity that is about 47% higher than that for the best layer without transport pores. This improvement requires transport pores with diameters not larger than about 60 μm. While the improvement potential significantly depends on the effective diffusivities, the effect of heat generation was found to be negligible.

Graphical abstract: Enhancing internal mass transport in Fischer–Tropsch catalyst layers utilizing transport pores

Back to tab navigation

Supplementary files

Publication details

The article was received on 25 Jun 2015, accepted on 03 Sep 2015 and first published on 07 Sep 2015


Article type: Paper
DOI: 10.1039/C5CY00957J
Catal. Sci. Technol., 2016,6, 275-287
  • Open access: Creative Commons BY license
  •   Request permissions

    Enhancing internal mass transport in Fischer–Tropsch catalyst layers utilizing transport pores

    H. Becker, R. Güttel and T. Turek, Catal. Sci. Technol., 2016, 6, 275
    DOI: 10.1039/C5CY00957J

    This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements