Hydrogen adsorption in metal organic frameworks by hydrogen spillover

A bi-organic-ligand type of Zn2(bdc)2dabco MOFs was synthesized and characterized in the present work. The catalytic properties of Pt/AC and Pd/AC were studied for hydrogen spillover in Zn2(bdc)2dabco modified by 5.0 wt.% of catalyst. The hydrogen adsorption capacity of modified Zn2(bdc)2dabco was significantly enhanced up to 3.35 wt.% by using the secondary spillover with carbon bridges measured at 1.5 bar and 77 K. Moreover, the prepared MOFs were also identified using FE-SEM, HR-TEM, XRD, XANES/EXAFS, and BET N2 adsorption isotherms techniques.

Figure optionsDownload high-quality image (149 K)Download as PowerPoint slideResearch highlights▶ A highly porous Zn2(bdc)2dabco MOF has been synthesized and characterized. ▶ Average diameter of Zn2(bdc)2dabco MOF is 15 μm identified by FE-SEM. ▶ Hydrogen uptake of modified Zn2(bdc)2dabco is up to 3.6 wt.% by spillover. ▶ Crystalline Pd/Pt nanoparticles in activated carbon facilitate H2 spillover. ▶ A MOF with more surface adsorption sites adsorbs more H2 via spillover.