A CH4-loaded hydroquinone (HQ) clathrate was synthesized via a gas-phase reaction using the a-form of crystalline HQ and CH4 gas at 12 MPa and room temperature. Solid-state C-13 cross-polarization/magic angle spinning (CP/MAS) NMR and Raman spectroscopic measurements confirm the incorporation of CH4 molecules into the cages of the HQ clathrate framework. The chemical analysis indicates that about 69% of the cages are filled by CH4 molecules, that is, 0.69 CH4 Per three HQ molecules. Rietveld refinement using synchrotron X-ray powder diffraction (XRD) data shows that the CH4-loaded HQ clathrate adopts the beta-form of HQ clathrate in a hexagonal space group R3 with lattice parameters of a = 16.6191 angstrom and c = 5.5038 angstrom. Time-resolved synchrotron XRD and quadrupole mass spectroscopic measurements show that the CH4-loaded HQ clathrate is stable LIP to 368 K and gradually transforms to the a-form by releasing the confined CH4 gases between 368-378 K. Using solid-state C-13 CP/MAS NMR, the reaction kinetics between the alpha-form HQ and CH4 gas is qualitatively described in terms of the particle size of the crystalline HQ.