ZrBDC-Based Functional Adsorbents for Small-Scale Methane Storage Systems

Metal-organic frameworks (MOF), potentially porous coordination structures, are envisioned for adsorption-based natural gas (ANG) storage, including mobile applications. The factors affecting the performance of ANG system with a zirconium-based MOF benzene dicarboxylic acid as linker (ZrBDC) an adsorbent were considered: textural properties and thermal effect arising upon adsorption. high-density ZrBDC-based pellets prepared by mechanical compaction as-synthesized powder at different pressures from 30 to 240 MPa 298 K without binder mixed polymer binders: polyvinyl alcohol (PVA) carboxyl methylcellulose (CMC). structural investigations revealed that ZrBDC PVA under was optimal produce ZrBDC-PVA more than twofold increase in packing density lowest degradation structure. specific total deliverable volumetric methane storage capacities adsorbents evaluated experimental data on adsorption measured up 10 within temperature range 253 333 K. It experimentally K, 100 mL tank loaded exhibited capacity 172 m3(NTP)/m3 when pressure dropped 0.1 MPa. used calculate important thermodynamic characteristic ZrBDC/CH4 system—the differential molar isosteric heat adsorption, which evaluate state functions: entropy, enthalpy, capacity. initial heats powdered isosteres found be ~19.3 kJ/mol, then these values decreased rates during In contrast, onto increased 19.4 kJ/mol maximum magnitude, width, position depended temperature, it fell. behaviors functions interpreted variation adsorbed molecules determined ratio CH4-CH4 CH4-ZrBDC interactions. changes systems adiabatic conditions; integrated 273 materials (charging) process did not exceed 14 much lower those reported activated carbons. results obtained direct relevance designing automotive industry, developing new gas-power robotics uncrewed aerial vehicles.