Thermal analysis and kinetic investigation of using a hybrid adsorption-hydration method to promote CO 2 capture
Energy, ISSN: 0360-5442, Vol: 313, Page: 133745
2024
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Metrics Details
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Article Description
In this work, a hybrid adsorption-hydration method was utilized to promote CO 2 capture. The CO 2 capture performance in the fixed bed of coal particles was assessed at various water saturations (0 %, 20 %, 40 %, 70 %, and 100 %), 277.15 K, and 3.2 MPa. It was found that gas consumption at 100 % water saturation increased by 45 % compared to that at 0 % water saturation (dry coal particles). Moreover, as the water saturation increased, CO 2 capture became dominated by hydrate formation rather than gas adsorption. The thermal analysis for CO 2 capture at 0 % and 100 % water saturation detected the exothermic peaks associated with CO 2 adsorption and CO 2 hydrate formation, as well as the endothermic peaks corresponding to CO 2 desorption and CO 2 hydrate dissociation. This confirms that CO 2 capture in the fixed bed of water-saturated coal particles consists of CO 2 adsorption followed by hydrate formation. The morphologies of CO 2 hydrate formation in the fixed bed of 100 % water-saturated coal particles were observed, and the mechanism of CO 2 capture using the hybrid adsorption-hydration method was illustrated based on the thermal analysis and kinetic investigations. It was also found that after the adsorption-hydration process, the average cumulative pore volume of the coal particles decreased by 14.47 % compared to the original coal particles, and the micropores and mesopores were predominantly affected. Therefore, utilizing the hybrid adsorption-hydration process in a fixed bed of coal particles provides a promising method to enhance CO 2 capture.
Bibliographic Details
Elsevier BV
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