Abstract
The formation and guest enclathration of hydroquinone (HQ) clathrates with gas mixtures were investigated for potential applications to a clathrate-based removal process for sulfides. The HQ clathrate samples were prepared with hydrogen sulfide (H2S)–carbonyl sulfide (COS)–nitrogen (N2) gas mixtures at pressures from 2.0 to 8.0 MPa and ambient temperature. Solid-state 13C NMR and Raman spectroscopy methods were used to identify the crystal structure of the samples and guest enclathration into the clathrate framework. Quantitative information regarding the amount of captured gases was obtained by a combination of the elemental analysis and the numerical integration of the NMR spectra. The results show that H2S can be more concentrated in the solid HQ clathrates than in the gas phase, depending on the formation pressure. In particular, COS did not participate in the enclathration under all conditions, indicating that the molecular size of COS is too large to fit into the cages of the HQ clathrate. The recov...
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