High-Capacity Hydrogen and Nitric Oxide Adsorption and Storage in a Metal-Organic Framework

Gas adsorption experiments have been carried out on a copper benzene tricarboxylate metal-organic framework material, HKUST-1. Hydrogen adsorption at 1 and 10 bar (both 77 K) gives an adsorption capacity of 11.16 mmol H-2 per g of HKUST-1 (22.7 mg g(-1), 2.27 wt %) at 1 bar and 18 mmol per g (36.28 mg g(-1), 3.6 wt %) at 10 bar. Adsorption of D-2 at 1 bar (77 K) is between 1.09 (at 1 bar) and 1.20(at < 100 mbar) times the H-2 values depending on the pressure, agreeing with the theoretical expectations. Gravimetric adsorption measurements of NO on HKUST-1 at 196 K (1 bar) gives a large adsorption capacity of similar to 9 mmol g(-1), which is significantly greater than any other adsorption capacity reported on a porous solid. At 298 K the adsorption capacity at 1 bar is just over 3 mmol g(-1). Infra red experiments show that the NO binds to the empty copper metal sites in HKUST-1. Chemiluminescence and platelet aggregometry experiments indicate that the amount of NO recovered on exposure of the resulting complex to water is enough to be biologically active, completely inhibiting platelet aggregation in platelet rich plasma.