Authors:
F. Crea Dipartimento di Chimica Università Della Calabria Arcavacata di Rende 87030 Rende CS Italy

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R. Mostowicz Industrial Chemistry Research Institute 01-793 Warsaw, Rydygiera 8 Poland

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F. Testa Dipartimento di Chimica Università Della Calabria Arcavacata di Rende 87030 Rende CS Italy

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R. Aiello Dipartimento di Chimica Università Della Calabria Arcavacata di Rende 87030 Rende CS Italy

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A. Nastro Dastec, Facoltà di Architettura Università di Reggio Calabria Via Diana 4 89125 Reggio Calabria Italy

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J. B. Nagy Facultés Universitaires Notre Dame de la Paix Laboratoire de Catalyse 5000 Namur Belgium

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By means of simultaneous DTA-, TG- and DTG-technique, the silicate gels and the MFI crystals obtained from these gels have been investigated. The gels have been prepared in presence and in absence of tetrapropylammonium cation (TPA+) and with Li+, Na+, NH4+ and K+ fluorides. In absence of TPA+ no thermal effects have been observed in Li+- and Na+-gels. The effects observed in the NH4+ -gel stem from a decomposition and release of inorganic phases: SiF4, NH4F, NH3. The DTA/DTG effects in the TPA+ containing gels and in the MFI crystals of monodisperse size are attributed to the decomposition of TPA+ cation. It can be concluded from these effects that the interaction between the gels and the TPA+ cation is rather weak. The interaction between TPA+ and MFI crystals obtained in fluoride medium is stronger than the interaction with crystals obtained from alkaline media. Similar thermal effects are obtained after grinding the long crystals to those having a large distribution of crystal sizes.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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