Dynamic Quantum Molecular Sieving Separation of D₂ from H₂–D₂ Mixture with Nanoporous Materials

Quantum molecular sieving separability of D₂ from an H₂–D₂ mixture was measured at 77 K for activated carbon fiber, carbon molecular sieve, zeolite and single wall carbon nanotube using a flow method. The amount of adsorbed D₂ was evidently larger than H₂ for all samples. The maximum adsorption ratio difference between D₂ and H₂ was 40% for zeolite (MS13X), yielding a selectivity for D₂ with respect to H₂ of 3.05

Anomaly of CH₄ Molecular Assembly Confined in Single-Wall Carbon Nanohorn Spaces

Vibrational−rotational properties of CH4 adsorbed on the nanopores of single-wall carbon nanohorns (SWCNHs) at 105−140 K were investigated using IR spectroscopy. The difference vibrational−rotational bands of the ν3 and ν4 modes below 130 K show suppression of the P and R branches, while the Q branches remain. The widths of the Q branches are much narrower than in the bulk gas phase due to suppression of the Doppler effect. These results indicate that the rotation of CH4 confined in the nanospaces of SWCNHs is highly restricted, resulting in a rigid assembly structure, which is an anomaly in contrast to that in the bulk liquid phase