Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 41: Issue 2-3
TG and DSC investigation of the dehydration of the extra large pore aluminophosphate molecular sieve VPI-5 and related materials
Authors:
E. Segal University of Bucharest, Faculty of Chemistry Department of Physical Chemistry Bulevardul Republicii 13 Bucharest Romania

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L. Maistriau Facultes Universitaires N.D. de la Paix Laboratoire de Catalyse 61 Rue de Bruxelles B-5000 Namur Belgium

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E. Derouane Facultes Universitaires N.D. de la Paix Laboratoire de Catalyse 61 Rue de Bruxelles B-5000 Namur Belgium

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Z. Gabelica Facultes Universitaires N.D. de la Paix Laboratoire de Catalyse 61 Rue de Bruxelles B-5000 Namur Belgium

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Pages:
701–712
Online Publication Date:
09 Jan 2007
Publication Date:
01 Feb 1994
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf02549343
Keywords:
dehydration; extra-large pore aluminophosphate; kinetics; TG-DTG-DTA
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Abstract  

The dehydration of a series of VPI-5 and H3 samples, synthesized under various conditions, as well as the solid state transformation of VPI-5 to AlPO4-8 have been investigated using combined TG-DTG-DSC and high-resolution solid state31P-NMR. The TG curves show a quasi-continuous release of water, the total loss being characteristic for each sample. Complete dehydration is achieved when the samples are heated from 20°C to about 150°C at various beating rates. Besides the main dehydration effect, several weak endothermic peaks are observed. These generally non-reproducible modulated peaks, recorded at high heating rates, are presumably due to the interactions of the water molecules leaving the channels of VPI-5 with the randomly positioned fragments stemming from the destruction of the water triple helix assemblage. The non-isothermal kinetic parameters of the dehydration have been evaluated from the TG and DTG curves recorded at low heating rates.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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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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