Application of various methods of nonisothermal kinetic analysis to magnesium hydroxide decomposition

Halikia, Iliana; Economacou, Antonia

dc.contributor.author	Halikia, Iliana	en
dc.contributor.author	Economacou, Antonia	en
dc.date.accessioned	2014-03-01T01:09:18Z
dc.date.available	2014-03-01T01:09:18Z
dc.date.issued	1993	en
dc.identifier.issn	0538-8066	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10888
dc.subject.classification	Chemistry, Physical	en
dc.subject.other	Gravimetric analysis	en
dc.subject.other	Heating	en
dc.subject.other	Linearization	en
dc.subject.other	Magnesium compounds	en
dc.subject.other	Mathematical models	en
dc.subject.other	Pyrolysis	en
dc.subject.other	Thermoanalysis	en
dc.subject.other	Activation energy	en
dc.subject.other	Arrhenius equation	en
dc.subject.other	Dehydroxylation	en
dc.subject.other	Magnesium hydroxide	en
dc.subject.other	Nonisothermal kinetic analysis	en
dc.subject.other	Nucleation	en
dc.subject.other	Thermogravimetry	en
dc.subject.other	Reaction kinetics	en
dc.title	Application of various methods of nonisothermal kinetic analysis to magnesium hydroxide decomposition	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/(SICI)1097-4601(1996)28:8<609::AID-KIN6>3.0.CO;2-Z	en
heal.identifier.secondary	http://dx.doi.org/10.1002/(SICI)1097-4601(1996)28:8<609::AID-KIN6>3.0.CO;2-Z	en
heal.language	English	en
heal.publicationDate	1993	en
heal.abstract	In the present study the determination of the mechanism of the thermal decomposition of magnesium hydroxide from thermogravimetric experiments is attempted. For this purpose nonisothermal kinetic analysis of the dynamic experimental data is applied, using different methods, which are based on the best linearization of a functional form of the Arrhenius equation. The experiments were carried out under nonisothermal conditions in a thermogravimetric analyzer with nitrogen atmosphere, at five different heating rates, i.e., 3, 8, 15, 20, and 35 deg/min. The nonisothermal methods used for the kinetic analysis of the experimental data were the Coats-Redfern method, the Romero et al., the improved Coats-Redfern method, the differential method, the differential by Jerez et al., and a method using the heating rate as a variable. Applying each of these methods, the kinetic parameters and, in most cases, the form of the conversion function (kinetic model) which governs the dehydroxylation process of Mg(OH)2 were determined. From the comparative study of the results of the above methods and using criteria about the credibility of each method, it was concluded that the kinetic model which represents the mechanism of the dehydroxylation of magnesium hydroxide, is that corresponding to the two dimensions nucleation with a reference value of activation energy 117.67 kJ/mol. (C) 1993 John Wiley & Sons, Inc.	en
heal.publisher	JOHN WILEY & SONS INC	en
heal.journalName	International Journal of Chemical Kinetics	en
dc.identifier.doi	10.1002/(SICI)1097-4601(1996)28:8<609::AID-KIN6>3.0.CO;2-Z	en
dc.identifier.isi	ISI:A1993LM83400002	en
dc.identifier.volume	28	en
dc.identifier.issue	8	en
dc.identifier.spage	609	en
dc.identifier.epage	631	en