The application of UV-Vis diffuse reflectance, IR transmission, Raman and ESR spectroscopies to the determination of extraframework and framework Ti in Titanium-silicalite is discussed in detail. The four methods give complementary information. In particular the utility of the UV-Vis and Raman spectroscopies to detect extraframework Ti is definitely established, while IR proves to be more useful for framework Ti. ESR spectroscopy can be also utilized on reduced samples to distinguish between the two types of Ti.
Framework and Extraframework Ti in Titanium-Silicalite: Investigation by Means of Physical Methods
ZECCHINA, Adriano;SPOTO, Giuseppe;BORDIGA, Silvia;
1991-01-01
Abstract
The application of UV-Vis diffuse reflectance, IR transmission, Raman and ESR spectroscopies to the determination of extraframework and framework Ti in Titanium-silicalite is discussed in detail. The four methods give complementary information. In particular the utility of the UV-Vis and Raman spectroscopies to detect extraframework Ti is definitely established, while IR proves to be more useful for framework Ti. ESR spectroscopy can be also utilized on reduced samples to distinguish between the two types of Ti.
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