Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 56: Issue 2
Studies on the Non-Isothermal Decomposition of H3PMo12O40·xH2O and H4PVMo11O40·yH2O
Authors:
V. Sasca Romanian Academy - Timişoara Branch Bd. M. Viteazul 24 RO-1900 Timişoara

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M. Ştefãnescu The Polytechnical University Faculty of Industrial Chemistry and Environmental Engineering RO-1900 Timişoara Piata Victoriei nr. 2 Romania

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A. Popa Romanian Academy - Timişoara Branch Bd. M. Viteazul 24 RO-1900 Timişoara

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Pages:
569–578
Online Publication Date:
08 Dec 2004
Publication Date:
01 Sep 1999
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010113013352
Keywords:
heteropolyacids; isoconversional method; non-isothermal analysis
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Abstract  

This paper reports a comparative study of the non-isothermal decompositions of the heteropolyacids HPM and HPVM, with structures consisting of Keggin units (KUs). Non-isothermal analysis at low heating rates demonstrated the existence of 4 crystal hydrate species, depending on the temperature. The stability domains of the anhydrous forms of HPM and HPVM were found to be 150–380°C, respectively. Processing of the TG curves obtained at different heating rates by the Ozawa method revealed that the decomposition of anhydrous HPM takes place according to a unitary mechanism, whilst for anhydrous HPVM two mechanisms are observed. Thus, the first part of the constitution water is lost simultaneously with the departure of vanadium from the KU as VO2+, while the second part is lost at higher temperatures as in the case HPM.

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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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