As candidate nanoporous material adsorbents for adsorbed xenon propellant storage, we consider the MOFs, SBMOF-1 , Ni-MOF-74 , HKUST-1 , SBMOF-2 , Co 3 (HCOO) 6 , MOF-505 [37] (=NOTT-100 ), and Ni(PyC) 2 and POC material CC3 . We also consider activated carbon as a baseline. We selected these materials because their experimentally measured xenon adsorption isotherms near 298 K are available in the literature . Fig. displays the crystal structures of the candidate nanoporous materials and their crystal densities (= ρ ads ). For activated carbon, which is amorphous, we took the density as that of 1230C coconut shell activated carbon, used in Ref. , from the data sheet in Ref. , 500 kg/m 3 .