A novel, liquid-phase hydrogen storage material was produced by mixing biphenyl (C12H10, solid) and diphenylmethane (C13H12, liquid) with a mass ratio (wt%) of 35:65. The eutectic mixture was proved to be liquid at ambient temperature with a viscosity of 3.0cP at 25°C and a vapor pressure of 1.4Pa at 25°C, which potentially meets the requirements for an efficient hydrogen storage system. A theoretical study using COSMO-RS method further confirms that an optimum composition of biphenyl and diphenylmethane for the formation of eutectic mixture is 37:63 by mass, which is very close to the composition found experimentally. The eutectic mixture exhibited a superior activity for hydrogenation reactions conducted at 120°C under 50bar of H2 pressure in the presence of a Ru (5wt%)/Al2O3 catalyst. Hydrogen uptake of the eutectic mixture tested was close to full conversion, which corresponds to 6.9wt% and 60.1gL-1 of gravimetric and volumetric hydrogen storage capacities, respectively.
- Heterogeneous catalysis
- Organic hydrogen energy carrier
- Sustainable chemistry
ASJC Scopus subject areas