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Adsorption of Methyl Iodide on Reduced Silver-Functionalized Silica Aerogel: Kinetics and Modeling
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  • Siqi Tang,
  • Seungrag Choi,
  • Yue Nan,
  • Lawrence Tavlarides
Siqi Tang
Syracuse University, Syracuse University
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Seungrag Choi
Syracuse University
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Yue Nan
Syracuse University
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Lawrence Tavlarides
Syracuse University
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Abstract

The low concentration methyl iodides (CH3I) adsorption process on reduced silver-functionalized silica aerogel (Ag0-Aerogel) was studied. The kinetic data were acquired using a continuous flow adsorption system. Because the corresponding physical process was observed, the shrinking core model (SCM) was modified and applied. An average CH3I pore diffusivity was calculated, the CH3I-Ag0-Aerogel reaction was identified as a 1.37 order reaction instead of first order reaction, and the nth order reaction rate constant was determined. This modified SCM significantly increases the accuracy of adsorption behavior prediction at low adsorbate concentration. Modeling results indicate that the overall adsorption process is controlled by the pore diffusion. However, at low adsorbate concentration (<100 ppbv), the CH3I adsorption is limited to the surface reaction due to the low uptake rate in a predictable time period.

Peer review status:IN REVISION

15 Jun 2020Submitted to AIChE Journal
18 Jun 2020Assigned to Editor
18 Jun 2020Submission Checks Completed
30 Jun 2020Reviewer(s) Assigned
16 Sep 2020Editorial Decision: Revise Major