In order to reduce emission of carbon dioxide (CO2) to the atmosphere, development of porous solid sorbents that can selectively capture and storage CO2 is of interest. However, the selective capture of CO2 at higher pressure remains poor. On the other hand, CO2 capture via gas-hydrate crystallization in confined porous media is emerging method in CO2 capture and storage. We show here that water (H2O) could be imbibed into porous carbons (PCs) to generate a final powder material with H2O to carbon weight of 1.5:1. Several porous carbons that differ in pore dimensions that range from supermicropores to mesopores will be reported. Furthermore, in situ vibrational spectroscopy on the CO2−captured carbon/H2O material revealed the formation of gas-hydrates. The H2O/CO2 molar ratio could reach a record value of 1.8, which shows a far greater CO2 in H2O capacity than ordinarily seen in CO2−hydrate formations. Our mechanistic proposal for attainment of such a low H2O/CO2 ratio within the PCs is based on the finding that most of the CO2 is captured in gaseous form within micropores of diameter &lt; 2 nm, wherein it is blocked by external CO2-hydrate formations generated in the larger mesopores. Therefore, in order to have efficient high pressure CO2 capture by this mechanism, it is necessary to have PCs with a wide pore size distribution consisting of both micropores and mesopores.

Efficient CO2 separation and storage in hydrated porous carbons

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.