| Issue |
J. Phys. IV France
Volume 7, Number C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
|
|
|---|---|---|
| Page(s) | C2-905 - C2-906 | |
| DOI | https://doi.org/10.1051/jp4:1997274 | |
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
J. Phys. IV France 7 (1997) C2-905-C2-906
DOI: 10.1051/jp4:1997274
1 Dipartimento di Chimica I.F.M., Via P. Giuria 7, 10125 Torino, Italy
2 Dipartimento di Scienza dei Materiali e Ingegneria Chimica Politecnico Torino, Italy
3 Dipartimento di Scienze Chimiche e Sincrotrone Trieste SCpA, Trieste, Italy
4 Dipartimento di Chimica Università "La Sapienza", Roma, Italy
© EDP Sciences 1997
J. Phys. IV France 7 (1997) C2-905-C2-906
DOI: 10.1051/jp4:1997274
CuI Sites in CuI–ZSM–5 : A XAFS, IR and Computer Graphics Study
C. Lamberti1, M. Salvalaggio1, S. Bordiga1, F. Geobaldo2, G. Spoto1, A. Zecchina1, G. Vlaic3 and M. Bellatreccia41 Dipartimento di Chimica I.F.M., Via P. Giuria 7, 10125 Torino, Italy
2 Dipartimento di Scienza dei Materiali e Ingegneria Chimica Politecnico Torino, Italy
3 Dipartimento di Scienze Chimiche e Sincrotrone Trieste SCpA, Trieste, Italy
4 Dipartimento di Chimica Università "La Sapienza", Roma, Italy
Abstract
IR and XAFS have been employed to investigate the local environment of CuI in CuI-ZSM-5 prepared by gas phase reaction of H-ZSM-5 with CuCl. Both XAFS and IR measurements show that copper species are momodispersed Cu ions, occupying highly unsaturated sites easily accessible to small ligand molecules. CuI-ZSM-5 prepared in this way represent a model solid for investigating the structure of isolated CuI sites in zeolites. EXAFS analysis reveal that, in vacuum conditions, CuI cations are surrounded by 2.5 ± 0.3 oxygens at 2.00 ± 0.02 Å. The combined use of EXAFS, IR and computer graphic simulations allows to infer that CuI ions in CuI-ZSM-5 are located in two families of sites.
© EDP Sciences 1997