Open AccessIn situ and ex situ XANES study of nanodispersed Mo species in zeolites used in fine chemistry catalysis
Author(s) -
Rentería Mario,
Traverse Agnès,
Anunziata Oscar A.,
Lede Eduardo J.,
Pierella Liliana,
Requejo Félix G.
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500018082
Subject(s) - xanes , calcination , in situ , catalysis , chemistry , zeolite , inorganic chemistry , analytical chemistry (journal) , organic chemistry , spectroscopy , physics , quantum mechanics
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 N 2 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.