Abstract
Organic hydroquinone (HQ) clathrates were synthesized by a gas-phase reaction between HQ and CO2/N2 gas mixtures under high-pressure conditions. The occupation behavior of guests and the gas storage capacity of the HQ clathrates were evaluated using solid-state 13C NMR, Raman spectroscopy, and elemental analyses. An in-depth examination of the solid-state 13C NMR and Raman results shows that CO2 molecules are captured within the HQ clathrate frameworks more easily than N2 molecules. Selectivity analysis indicates that the efficient separation of CO2 from the CO2/N2 mixtures up to 98 mol % can be attained by the formation of the HQ clathrates, depending on the gas compositions. Complete conversion of pure α-form HQ to the HQ clathrates results in a gas storage capacity of 1.98–2.82 mol/kg.
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