Abstract
Diffuse reflectance infrared spectroscopy, combined with thermogravimetry, of progressively dehydrated (up to 550°C) silicoaluminophosphate (SAPO-34) reveals that, at room temperature, there is a stoichiometric proton transfer from the bridging hydroxyl Brönsted acid site to the physisorbed water. All six predicted infrared vibrations for the H3O+ oxonium ion in Cs or C1 symmetry are identified. In a typical sample there are 10.0 × 1020 H3O+ ions g-1.
Lingua originale | Inglese |
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pagine (da-a) | 8109-8112 |
Numero di pagine | 4 |
Rivista | Journal of Physical Chemistry |
Volume | 97 |
Numero di pubblicazione | 31 |
DOI | |
Stato di pubblicazione | Pubblicato - 1993 |
Pubblicato esternamente | Sì |