The experimental isosteric heat, Q(st), for molecular hydrogen adsorption in a Cu-exchanged zeolite ZSM-5 was determined as a function of the hydrogen loading. Q(st) was found to vary in a stepwise manner between 73 +/- 5 and 39 +/- 4 kJ/mol H-2. This behaviour suggests the presence of different groups of adsorption sites, some of which have the appropriate thermodynamics necessary for an ambient conditions sorption based H-2 storage medium. Our data can be directly related to model calculations and inelastic neutron scattering spectra. From a thermodynamic point of view, they confirm the feasibility of hydrogen storage applications based on molecular chemisorption of hydrogen.
|Titolo:||Room temperature isosteric heat of dihydrogen adsorption on Cu(I) cations in zeolite ZSM-5|
|Autori interni:||ALBINATI, ALBERTO (Secondo)|
|Settore Scientifico Disciplinare:||Settore CHIM/03 - Chimica Generale e Inorganica|
|Data di pubblicazione:||nov-2007|
|Digital Object Identifier (DOI):||10.1016/j.cplett.2007.10.054|
|Appare nelle tipologie:||01 - Articolo su periodico|