Solid-state hydrogen hydrates formation in a low- concentration MOF complexed with 1,3-DIOX

Hydrogen (H 2 ) storage in cluster hydrates is a safe and effective method. However, the strict formation conditions of pure hydrogen hydrates and the obstruction of gas-liquid mass transfer have seriously hindered the effective application of hydrogen hydrates. To enhance the formation of hydrogen hydrates, it was proposed to use metal-organic framework materials as kinetic promoters to enhance the formation of H 2 /1,3-DIOX hydrates. The experimental conditions in this paper were 271.65   K, 13.2   MPa and 9.2   MPa with 5.56   mol% 1,3-DIOX. Adding 2000 ppm MOF-808 to the composite system increased the volume capacity of hydrogen storage by 77.56% and shortened the t 90 time by 59.76%. When the gas-liquid ratio is 3.40, the weight capacity of hydrogen storage can be 0.53 ± 0.01   wt%. Five cycles later, the MOF-808 structure remained intact. The research results obtained in this paper are highly significant to guide the application of metal-organic framework materials in hydrogen hydrates.