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Preparation, characterization and hydrogen sorption study of MIL-101(Cr) pellets

The paper discusses the bulk (25 g/batch) synthesis of MIL-101(Cr) using acetic acid and its pelletization as hydrogen storage material for on-board automotive applications. The synthesized material was moulded into a shaped body (a pellet) using binders such as sodium salt of carboxy methyl cellulose (Na-CMC), starch (ST) and polyvinyl alcohol (PVA) as well as a pellet without binder. Pellets were prepared using an hydraulic press by applying different pressures (5, 10 and 15 tonnes; where 1 tonne per square metre = 9.80665 kPa). The research team investigated the effect of compression pressure on the pellet properties and also its hydrogen adsorption capacity. The surface area and micropore volume decreased with the increase of compression pressure. The Dubinin-Radushkevich (DR) equation was used to calculate micropore volume. The maximum hydrogen storage capacity obtained is 2.54 wt.% at temperature of 77 Kelvin (K) using 10% PVA as a binder at 10 tonnes compression pressure. MIL-101(Cr) pellets prepared without binder, compressed at 10 tonnes pressure, showed 3.10 wt.% hydrogen storage capacity at the temperature of 77 K.