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Kinetic model for moisture-controlled CO2 sorption.

Yuta Kaneko1, Klaus S Lackner1

  • 1School of Sustainable Engineering & The Built Environment, Arizona State University, Tempe, AZ 85287, USA. Klaus.Lackner@asu.edu.

Physical Chemistry Chemical Physics : PCCP
|August 26, 2022
PubMed
Summary
This summary is machine-generated.

A new model explains carbon dioxide (CO2) sorption kinetics in materials. It shows that slow reaction or diffusion rates limit CO2 capture, a key challenge for practical applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Understanding sorption/desorption kinetics is crucial for effective moisture-controlled CO2 capture.
  • Existing models may not fully capture the complex interplay of reaction and diffusion in sorbent materials.

Purpose of the Study:

  • To develop and validate an analytic model for moisture-controlled CO2 sorption kinetics.
  • To differentiate between surface reaction kinetics and interior diffusive transport as rate-limiting steps.
  • To establish a generalized effective diffusivity (DM) that unifies these kinetic contributions.

Main Methods:

  • Development of an analytic kinetic model for CO2 sorption.
  • Analysis of two limiting cases: surface reaction dominance and interior diffusion dominance.
  • Mathematical formulation combining carbon species and simplifying diffusion equations.
  • Experimental validation using transient CO2 flux measurements in a commercial anion exchange membrane.

Main Results:

  • The model accurately describes reaction kinetics as a combination of 1st and 2nd order processes.
  • Interior transport kinetics are governed by non-linear diffusion equations.
  • A generalized effective diffusivity (DM) was introduced, combining surface reaction and diffusion.
  • Experimental data fit the 1st order model, with DM values indicating slow kinetics (6.6-7.1 × 10^-14 m²/s at 35°C).

Conclusions:

  • The developed model provides a unified framework for understanding CO2 sorption kinetics.
  • Slow kinetics, particularly diffusion and reaction rates, represent a significant barrier to practical CO2 capture applications.
  • The model's predictions of CO2 pumping flux in active membranes highlight potential for CO2 transport against concentration gradients, driven by water flux.