Investigation of mass transport characteristics of CO2 adsorption onto activated carbon: An experimental and numerical study
Assilbekov B. Pal A. Islam M.A. Saha B.B.
September 2024Elsevier Ltd
International Communications in Heat and Mass Transfer
2024#157
This study experimentally and numerically investigated CO2 adsorption characteristics onto a highly porous activated carbon. Adsorption kinetics and isotherms experiments were conducted using a high-precision thermogravimetric analyzer. The effects of key parameters, specifically adsorbent bed thickness, temperatures, and pressure, were considered. The two isotherm models were employed to correlate the measured data, and they showed a decent fit. Numerical simulations were carried out using COMSOL Multiphysics software under a coupled heat and mass transfer model. The simulated results showed a reasonable agreement with the experimental uptakes for all studied parameters. The results also showed that the diffusion time constant Ds0/Rp2 is pressure-dependent and varies with the adsorbent bed thickness. The Ds0/Rp2 at each adsorption temperature is calculated and fitted with the Arrhenius equation. Estimated averaged values of limiting Ds0/Rp2 for adsorbent bed thicknesses of 0.9, 5, and 25 mm, respectively, equal to 2.18 × 10−1, 8.64 × 10−2, and 2.05 × 10−2 1/s. Linearly increasing adsorbent bed thickness causes a rapid nonlinear drop in Ds0/Rp2. The findings from this research provide valuable information on the mass transfer characteristics of CO2 onto activated carbon. So, engineers can design optimized heating/cooling systems that operate more effectively, resulting in higher efficiency, reduced system costs, and lower carbon emissions.
Adsorbent bed thickness , Adsorption isotherms , Adsorption kinetics , CFD simulations , CO2 adsorption , Maxsorb-III
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International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
Laboratory of Computational Modeling and Information Technologies, Satbayev University, Almaty, 050013, Kazakhstan
Department of Nuclear Engineering, University of Dhaka, Dhaka, 1000, Bangladesh
Mechanical Engineering Department, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)
Laboratory of Computational Modeling and Information Technologies
Department of Nuclear Engineering
Mechanical Engineering Department
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