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The Effect of Diffusion on the Hydrotreatment of n-C16: A Novel Method to Calculate the Weisz-Prater Number
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  • Junhao Sun,
  • Chao Mu,
  • Yi Li,
  • Yujun Zhao,
  • Shengping Wang,
  • Xinbin Ma
Junhao Sun
Tianjin University
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Chao Mu
Tianjin University
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Yi Li
Tianjin University
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Yujun Zhao
Tianjin University
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Shengping Wang
Tianjin University
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Xinbin Ma
Tianjin University
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Abstract

Weisz-Prater number (NW-P) is often applied to assess the internal diffusion effect in heterogeneous catalytic reactions. However, the traditional calculation method with excessive empirical reference values affects the accuracy remarkably. A series of Pt/HPMo/SBA-15 catalysts with the pore size as a single variable were prepared to calculate the NW-P with a developed model combining the diffusion-reaction kinetic method. Utilizing dimensionless variables, internal effectiveness factor (η) and Thiele modulus (Φ_n), and the apparent activities over catalysts with different diffusion capacity, NW-P is obtained with improved accuracy. For the diffusion effect on the hydrotreatment of n-C16, according to the more precise NW-P, the pore size should be not less than 10 nm to avoid the step-limitation of internal diffusion in the premise of adequate acid sites. Using the novel method, a conclusion is drawn that the formation of m-i-C16 is more susceptible to internal diffusion than the consumption of n-C16.

Peer review status:ACCEPTED

15 Nov 2020Submitted to AIChE Journal
16 Nov 2020Submission Checks Completed
16 Nov 2020Assigned to Editor
24 Nov 2020Reviewer(s) Assigned
17 Jan 2021Editorial Decision: Revise Major
27 Feb 20211st Revision Received
02 Mar 2021Submission Checks Completed
02 Mar 2021Assigned to Editor
06 Mar 2021Reviewer(s) Assigned
06 Apr 2021Editorial Decision: Revise Minor
13 Apr 20212nd Revision Received
18 Apr 2021Submission Checks Completed
18 Apr 2021Assigned to Editor
04 May 2021Editorial Decision: Accept