| Issue |
J. Phys. IV France
Volume 7, Number C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
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|---|---|---|
| Page(s) | C2-851 - C2-853 | |
| DOI | https://doi.org/10.1051/jp4:1997257 | |
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
J. Phys. IV France 7 (1997) C2-851-C2-853
DOI: 10.1051/jp4:1997257
1 Dipartimento di Chimica I.F.M., Via P. Giuria 7, 10125 Torino, Italy
2 Dipartimento di Scienze Chimiche e Sincrotrone Trieste SCpA, Trieste, Italy
3 ENICHEM SpA, Centro di Ricerche di Novara, Via G. Fauser 4, Novara, Italy
4 ENI RICERCHE, Via F. Maritano 26, 20097 S. Donato (Mi), Italy
© EDP Sciences 1997
J. Phys. IV France 7 (1997) C2-851-C2-853
DOI: 10.1051/jp4:1997257
XAFS, IR, Raman and UV-Vis Characterization of Framework Ti(IV) Species in Ti-Silicalites
C. Lamberti1, S. Bordiga1, A. Zecchina1, G. Vlaic2, G. Tozzola3, G. Petrini3 and A. Carati41 Dipartimento di Chimica I.F.M., Via P. Giuria 7, 10125 Torino, Italy
2 Dipartimento di Scienze Chimiche e Sincrotrone Trieste SCpA, Trieste, Italy
3 ENICHEM SpA, Centro di Ricerche di Novara, Via G. Fauser 4, Novara, Italy
4 ENI RICERCHE, Via F. Maritano 26, 20097 S. Donato (Mi), Italy
Abstract
The main results obtained by using IR, Raman and UV-Vis techniques concerning the structure of the Ti(IV) center in Ti-silicalite is briefly reviewed and discussed with recent XAFS results. The Ti(IV) is in tetrahedral coordination in vacuo and expands its coordination sphere upon interaction with adsorbates. Present EXAFS results indicate, for the dehydrated sample, a first shell coordination number higher then four (4.45 ± 0.3), suggesting, in a fraction of sites, the substitution of a bridged oxygen with two OH groups.
© EDP Sciences 1997