Structural and dynamic properties of confined hydrogen isotopes (H2, HD, D2) in model porous materials:: Silicalite-I, AlPO4-N family (N = 5, 81 11, 54) and MCM-41 (empty set = 25 Å)

Structural and dynamic properties of confined hydrogen isotopes (H-2, HD, D-2) in model porous materials are investigated by neutron scattering. Among our results concerning the D-2/AlPO4-N family system, we found the structure of confined D-2 in AlPO4-5 to be composed of a "quadrimers" chain, which is partially commensurate with the inner surface sorption sites. Concerning the zeolite mixture sample composed of AlPO4-54 (40%), AlPO4-8 (40%) and AlPO4-11 (20%), we determined the filling sequences by D-2 molecular sorbate which surprisingly is: AlPO4-11 filling first, AlPO4-54 filling second and filling last, AlPO4-8. (c) 2007 Elsevier Inc. All rights reserved.