Non-isothermal pore change model predicting CO2 adsorption onto consolidated activated carbon
Berdenova B. Pal A. Saha B.B. Kaltayev A.
October 2021Elsevier Ltd
International Journal of Heat and Mass Transfer
2021#177
Accurate simulation and detailed description of the dynamics of the adsorption process play a significant role in forecasting the performance of new materials when used in various adsorption systems, like cooling/heating. The activated carbon (AC) consolidation allows improving the heat transfer rate inside the adsorption/desorption bed and compacting the systems. There are numerous mathematical models in literature for gas adsorption onto granular AC. But for consolidated AC, because of the absence of macropores, most assumptions that work well for granular AC may lead to significant discrepancies. Therefore, the present research proposes a new mathematical model for gas (CO2) adsorption onto consolidated adsorbent, a non-isothermal pore change model. The model takes into account the porosity and permeability changes due to the adsorption. The validation of the developed model is performed via comparison with the results obtained experimentally and numerically using an isothermal model. The effective Knudsen diffusion coefficient for the working pair is evaluated from porosity data. The rate of adsorption or mass transfer coefficient is estimated using the vant Hoff plot. The study results could be applied in the development of waste heat-driven cooling systems employing consolidated composite material as the adsorbent. The proposed mathematical model is also applicable for many other working pairs.
Activated carbon , CO2 adsorption , Consolidated adsorbent , Knudsen diffusion , Non-isothermal model
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Faculty of Mechanics and Mathematics, Al-Farabi Kazakh National University, 71 Al Farabi ave., Almaty, 050040, Kazakhstan
Department of Nuclear Engineering, University of Dhaka, Dhaka, 1000, Bangladesh
International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
Mechanical Engineering Department, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
School of Industrial Engineering, Satbayev University, 22a Satpaev str., Almaty, 050013, Kazakhstan
Faculty of Mechanics and Mathematics
Department of Nuclear Engineering
International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)
Mechanical Engineering Department
School of Industrial Engineering
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