Here, tuning patterns of methane (CH4) inclusion in isoxazole (C3H3NO) clathrate hydrates were experimentally investigated through spectroscopic observations. Powder X-ray diffraction (PXRD) was used to analyze the crystal structure of binary (isoxazole + CH4) clathrate hydrates having two different hydration numbers (C3H3NO with 17H2O and C3H3NO with 34H2O systems). Raman spectroscopy was used to reveal the possible tuning patterns of CH4 inclusion in isoxazole clathrate hydrates. Both spectroscopic results showed that both clathrate hydrate samples exhibits same cubic Fd3m structure II hydrate as expected, and CH4 can be captured in both small and large cavities of structure II hydrate in C3H3NO with 34H2O system while CH4 can be entrapped in only small cavities of structure II hydrate in C3H3NO with 17H2O system. The phase equilibrium conditions of binary (isoxazole + CH4) clathrate hydrate were also measured through high-pressure micro differential scanning calorimetry and the equilibrium temperatures of binary (isoxazole + CH4) clathrate hydrate at given pressures are higher than those of pure CH4 hydrate. The present findings are expected to provide the useful information for better understanding of novel tuning reaction pathways in isoxazole clathrate hydrates that might be significantly affected by the hydration numbers.
See more of this Group/Topical: Engineering Sciences and Fundamentals