Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 101: Issue 3
On the thermal degradation of 3-methylaminopropylamine captured inside the aluminum phosphate analog of ULM-3
Authors:
Nevenka Rajic Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, 11000 Serbia

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Djordje Stojakovic Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, 11000 Serbia

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Sanja Jevtic Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, 11000 Serbia

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Natasa Logar National Institute of Chemistry, Hajdrihova 19, Ljubljana, 1000 Slovenia

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Gregor Mali National Institute of Chemistry, Hajdrihova 19, Ljubljana, 1000 Slovenia

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Venceslav Kaucic National Institute of Chemistry, Hajdrihova 19, Ljubljana, 1000 Slovenia

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Pages:
919–924
Online Publication Date:
26 Oct 2009
Publication Date:
01 Sep 2010
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-009-0504-7
Keywords:
Thermal degradation; Kinetics; Aluminophosphate; Porous; Open-framework; ULM-3
Restricted access

Abstract  

An open-framework aluminophosphate analog of the fluorogallophosphate structure-type ULM-3 was obtained by hydrothermal crystallization of an aqueous aluminum phosphate suspension in the presence of 3-methylpropylamine (MAPA) and hydrofluoric acid. The open-framework fluorinated aluminophosphate structure was confirmed by Rietveld analysis and the 27Al, 31P, and 19F MAS NMR spectroscopy. The MAPA, located in the ten-membered ring channels, is doubly protonated to balance the negative charge of the Al3P3O12F22– framework. Thermogravimetric analysis data have been used to study kinetics of the thermal decomposition of MAPA. The decomposition was found to be a complex process, its activation energy varied from 177 to 259 kJ mol−1. The relatively high E values are explained by the fact that the MAPA cations are bound to the anionic framework both by electrostatic forces as well as strong N-H…O hydrogen bonds. The strength of the interactions is indirectly confirmed by the in situ high temperature X-ray diffraction analysis which shows that the MAPA decomposition leads to a phase transformation of the open-framework structure to the dense trydimite phase.

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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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