In this work, CAU-10-H@γ-AlOOH is prepared, and
then UTSA-16
is loaded on CAU-10-H@γ-AlOOH to obtain UTSA-16@CAU-10-H@γ-AlOOH.
Using the as-prepared composites as stationary materials by cryogenic
gas chromatography at 77 K, while CAU-10-H@γ-AlOOH achieves
the complete separation of ortho-H2 (o-H2) and D2 with a resolution R of 1.66 and a separation time t of 9.52
min, UTSA-16@CAU-10-H@γ-AlOOH achieves higher efficiency separation
of hydrogen isotopes in a shorter separation time (4.56 min) with R = 1.7. Molecular simulation results show that CAU-10-H
has both chemical affinity quantum sieving and kinetic sieving effects
for H2/D2 at 77 K, and UTSA-16 can only exert
the kinetic sieving effect. UTSA-16’s load on CAU-10-H@γ-AlOOH
weakens the adsorption of hydrogen isotopes, and the presence of Co2+ in UTSA-16 promotes the conversion of para-H2 to ortho-H2. In gas chromatography,
H2 was preferentially desorbed from the system due to strong
D2 adsorption caused by the chemical affinity quantum sieving
effect and faster H2 diffusion caused by the kinetic sieving
effect. These additive effects achieved efficient hydrogen isotope
separation at 77 K.