Mixed-linker approach in designing porous zirconium-based metal-organic frameworks with high hydrogen storage capacity

Three highly porous Zr(IV)-based metal-organic frameworks, UBMOF-8, UBMOF-9, and UBMOF-31, were synthesized by using 2,2'-diamino-4,4'- stilbenedicarboxylic acid, 4,4'-stilbenedicarboxylic acid, and combination of both linkers, respectively. The mixed-linker UBMOF-31 showed excellent hydrogen uptake of 4.9 wt% and high selectivity for adsorption of CO2 over N-2 with high thermal stability and moderate water stability with permanent porosity and surface area of 2552 m(2) g(-1).