title: In situ and ex situ XANES study of nanodispersed Mo species in zeolites used in fine chemistry catalysis.
abstract: Mo K-edge XANES experiments on Mo-containing zeolites at low Mo loading (1 and 2 wt% of Mo on H-ZSM-11, H-BETA and H-ZSM-5 catalysts), active in fine chemistry reactions, were performed ex situ as function of sample calcination temperature in air (in the range 773-973 K) or in situ at 873 and 973K under N2 flow. The results showed a 4-fold oxygen coordination for the incorporated Mo species in the activated (dehydrated) state. Combining these results with additional data evidences an almost total Mo exchange inside the zeolite channels.
authors.affiliation: LURE, Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, Université Paris-Sud, Orsay, France. renteria@lure.u-psud.fr
authors.forename: M
authors.initials: M
authors.lastname: Rentería
authors.forename: A
authors.initials: A
authors.lastname: Traverse
authors.forename: O A
authors.initials: OA
authors.lastname: Anunziata
authors.forename: E J
authors.initials: EJ
authors.lastname: Lede
authors.forename: L
authors.initials: L
authors.lastname: Pierella
authors.forename: F G
authors.initials: FG
authors.lastname: Requejo