Near-IR diffuse reflectance spectra show the absence of hydroxyls in natural heulandite and the presence of hydroxyls in its heat-collapsed phases B and I. These results, compared with analogous ones of barrerite and stellerite, indicated the impossibility for a framework, which has been interrupted by heat-induced dehydration, to re-form by rehydration the original topol. of the natural phase. In general, there was a direct correlation between the amt. of new T-O-T bridges and the mobility of the new framework in zeolites built by connecting 4-4-1 secondary building units.
Dehydration and re-hydration of the zeolites with 4-4-1 SBU's: near IR evidence for topological changes in heulandite I / A., Alberti; Vezzalini, Maria Giovanna; F., Cariati; L., Erre; P., Piu. - In: ZEOLITES. - ISSN 0144-2449. - STAMPA. - 5:(1985), pp. 289-291.
Dehydration and re-hydration of the zeolites with 4-4-1 SBU's: near IR evidence for topological changes in heulandite I
VEZZALINI, Maria Giovanna;
1985
Abstract
Near-IR diffuse reflectance spectra show the absence of hydroxyls in natural heulandite and the presence of hydroxyls in its heat-collapsed phases B and I. These results, compared with analogous ones of barrerite and stellerite, indicated the impossibility for a framework, which has been interrupted by heat-induced dehydration, to re-form by rehydration the original topol. of the natural phase. In general, there was a direct correlation between the amt. of new T-O-T bridges and the mobility of the new framework in zeolites built by connecting 4-4-1 secondary building units.
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