title: H(2) formation by electron irradiation of SBA-15 materials and the effect of Cu(II) grafting.
abstract: Measurement of H(2) production from electron irradiation (10 MeV) on SBA-15 materials has shown that adsorbed water is attacked preferentially. Silanol groups are only attacked when they are in the majority with respect to adsorbed water, however they are much less efficient at producing H(2). The comparison between water content before and after electron irradiation and the corresponding H(2) production indicates that water desorption is the main route to adsorbed water loss for SBA-15 materials. On the other hand, surface silanol groups are more susceptible to attack, leading to H(2) production when SBA-15 samples have undergone extensive thermal treatment. Electron irradiation of SBA-15-Cu materials has shown that the presence of Cu(II) on the surface reduces and inhibits the production of H(2.) This inhibiting power affects adsorbed water bonded to grafted copper but not surface silanol groups.
authors.affiliation: Laboratoire de Chimie Physique, UMR 8000, Université de Paris-Sud, Bât. 349, 91405 Orsay, France. nancy.brodie-linder@cea.fr
authors.forename: Nancy
authors.initials: N
authors.lastname: Brodie-Linder
authors.forename: Sophie
authors.initials: S
authors.lastname: Le Caër
authors.forename: Mohammad Shahdo
authors.initials: MS
authors.lastname: Alam
authors.forename: Jean Philippe
authors.initials: JP
authors.lastname: Renault
authors.forename: Christiane
authors.initials: C
authors.lastname: Alba-Simionesco