Spectroscopic studies of Fe(III) ion-exchanged ETS-10 and ETAS-10 molecular sieves
- Univ. of Utah, Salt Lake City, UT (United States); and others
Two new titanium silicate molecular sieves, designated ETS-10 and ETAS-10, have been ion-exchanged with Fe(III). Both products exhibit prominent EPR signals, at g = 6.0 and 4.3, that are assigned to populations of ferric iron on the surface and in the interior cavities, respectively, of the molecular sieve microcrystals. Corollary XPS measurements on these samples indicate that a substantial fraction of the surface iron is present as Fe(II). Chemical modification procedures have been explored in an effort to produce ion-exchanged materials containing no exterior iron. Acid treatment (pH 1.0) proved to be an effective means of achieving this goal in the case of ETS-10-based materials. ETAS-10-based samples do not retain their crystallinity under these conditions. 35 refs., 4 figs., 2 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 554944
- Journal Information:
- Journal of Physical Chemistry, Vol. 96, Issue 24; Other Information: PBD: 26 Nov 1992
- Country of Publication:
- United States
- Language:
- English
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