Author/Authors :
Otero Are?n، نويسنده , , C. and Manoilova، نويسنده , , O.V. and Bonelli، نويسنده , , B. and Rodr?́guez Delgado، نويسنده , , M. and Turnes Palomino، نويسنده , , G. and Garrone، نويسنده , , E.، نويسنده ,
Abstract :
Thermodynamic characterisation of the adsorption process (at a low temperature) of dihydrogen on the zeolite Li-ZSM-5 was carried out by means of variable-temperature infrared spectroscopy, with the simultaneous measurement of temperature and equilibrium pressure. Adsorption renders the H–H stretching mode infrared active, at 4092 cm−1. The standard adsorption enthalpy and entropy resulted to be ΔH0=−6.5(±0.5) kJ mol−1 and ΔS0=−90(±5) J mol−1 K−1, respectively. The adsorption enthalpy is significantly larger than the liquefaction heat, and this fact renders Li-ZSM-5 a potential cryoadsorbent for hydrogen storage.
