HYDROGEN SPECIES IN CeNi1OY AND CeAl0.5Ni1OY MIXED OXIDES CATALYTIC HYDROGEN RESERVOIRS
Résumé
Interaction of hydrogen with cerium nickel and aluminium based mixed oxides (CeNi1OY and CeAl0.5Ni1OY) has been studied by catalytic hydrogenation and inelastic neutron scattering (INS). The mixed oxides are large catalytic hydrogen reservoirs and the presence of Al allows increasing hydrogen storage and giving a better stability to the system, in particular, with temperature. Neutron spectroscopy evidences in the solids studied the coexistence of different hydrogen species that can be related to hydride species, hydrogen species in interaction with metallic nickel, as well as hydrogen species from hydroxyl groups. The mobility and reactivity of these hydrogen species have been analysed and discussed.