Quantitative Understanding of the Adsorption Equilibria of Acetone on Mesoporous Silica MSU-H in Supercritical CO2
The adsorption process in supercritical CO2 is particularly effective for the separation of volatile organic compounds (VOCs) from solutions and is essential for solvent recovery and the purification of target components. Mesoporous silica, such as MSU-H, is a promising adsorbent due to its strong i...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2025-12-01
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| Series: | Journal of Chemical Engineering of Japan |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/00219592.2025.2457390 |
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| Summary: | The adsorption process in supercritical CO2 is particularly effective for the separation of volatile organic compounds (VOCs) from solutions and is essential for solvent recovery and the purification of target components. Mesoporous silica, such as MSU-H, is a promising adsorbent due to its strong interactions with polar molecules. In this study, we quantitatively evaluated the adsorption equilibrium of acetone on MSU-H type mesoporous silica in supercritical CO2 at T = (333–353) K and P = (10.0–15.0) MPa using a fixed-bed adsorption system. Comparative analyses were also conducted with MCM-41 type mesoporous silica and activated carbon under similar conditions. The Dubinin-Astakhov (DA) equation was employed to model the adsorption data, providing parameters with clear physical significance, such as interaction energy and saturated adsorption capacity. The results demonstrated that MSU-H exhibited a significantly higher adsorption capacity than MCM-41 or activated carbon, attributed to its large pore size and high silanol group density. Moreover, as the CO2 density increased, the adsorption of CO2 onto the adsorbent was enhanced, which competed with the adsorption of VOCs and resulted in a decrease in the adsorption capacity. The analysis of the DA parameters offered a quantitative insight into the equilibrium adsorption of acetone on the adsorbent in supercritical CO2, accounting for the interactions between the adsorbent, adsorbate, and CO2. |
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| ISSN: | 0021-9592 1881-1299 |