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Mass Transfer Advantage of Hierarchical Structured Cobalt-based Catalyst Pellet for Fischer-Tropsch Synthesis
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  • congcong Niu,
  • Hansheng Li,
  • Ming Xia,
  • Jungang Wang,
  • Congbiao Chen,
  • Zhongyi Ma,
  • Litao Jia,
  • Bo Hou,
  • Debao Li
congcong Niu
Chinese Academy of Sciences Institute of Coal Chemistry
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Hansheng Li
State Key Laboratory of Fluorinated Functional Membrane Materials
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Ming Xia
Chinese Academy of Sciences Institute of Coal Chemistry
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Jungang Wang
Chinese Academy of Sciences Institute of Coal Chemistry
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Congbiao Chen
Chinese Academy of Sciences Institute of Coal Chemistry
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Zhongyi Ma
Chinese Academy of Sciences Institute of Coal Chemistry
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Litao Jia
Chinese Academy of Sciences Institute of Coal Chemistry
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Bo Hou
Chinese Academy of Sciences Institute of Coal Chemistry
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Debao Li
Chinese Academy of Sciences Institute of Coal Chemistry
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Abstract

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 C5+ space-time yield to the maximum. This work could provide a theoretical guideline for the engineering design of the hierarchical structured catalyst pellet.

Peer review status:UNDER REVIEW

04 Sep 2020Submitted to AIChE Journal
12 Sep 2020Assigned to Editor
12 Sep 2020Submission Checks Completed
15 Sep 2020Reviewer(s) Assigned