MOF-808(Hf) demonstrates a higher elastic modulus (37.5 ± 3.4 GPa) than that of MOF-808(Zr) (26.9 ± 5.2 GPa). In addition, MOF-808(Hf) shows a volumetric methane deliverable capacity of 110 v_(STP) v~(–1), which is among the highest-performing Zr/Hf-based MOFs for methane ...