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The isoconversional method for determination of energy of activation at constant heating rates

Corrections for the Doyle approximation

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Abstract

The isoconversional method for the determination of energies of activation from the reciprocal temperature at which a fraction of conversion was reached in experiments at differing constant heating rates is reviewed and amplified. The error introduced into the calculation of activation energy by the use of a linear approximation of the logarithm of the temperature integral is discussed. Methods for the correction of this error are developed and a table of correction factors are given.

Zusammenfassung

Es wird eine Literaturübersicht über die und eine ausführliche Darstellung der Isokonversionsmethode zur Bestimmung von Aktivierungsenergien aus den Reziprokwerten derjenigen Temperaturen gegeben, bei denen ein bestimmter Konversionsgrad in Experimenten mit verschiedener Aufheizgeschwindigkeit erreicht wird. Der in die Berechnung der Aktivierungsenergie durch lineare NÄherung des Logarithmus des Temperaturintegrals eingehende Fehler wird diskutiert. Es werden Methoden zur Korrektur dieses Fehlers entwickelt und Korrekturfaktoren in Tabellenform angegeben.

РЕжУМЕ

сДЕлАН ОБжОР И РАсшИР ЕН ИжОкОНВЕРсИОННыИ МЕтОД ОпРЕДЕлЕНИь ЁН ЕРгИИ АктИВАцИИ Иж ОБРАтНОИ тЕМпЕРАт УРы, пРИ кОтОРОИ ДОстИ гАЕтсь ФРАкцИь кОНВЕРсИИ В Ё кспЕРИМЕНтЕ пРИ РАжлИЧАУЩИхсь пО стОьННых скОРОстьх Н АгРЕВА. ОБсУжДЕНА ОшИБкА ВыЧ ИслЕНИь ЁНЕРгИИ АктИВАцИИ, ОБУслОВлЕ ННАь ИспОльжОВАНИЕМ лИНЕИНОгО пРИБлИжЕНИь лОгАРИФ МА тЕМпЕРАтУРНОгО ИНтЕгРАлА. РАжВИты МЕ тОДы ИспРАВлЕНИь ЁтО И ОшИБкИ И пРИВЕДЕНА тАБлИцА кОРРЕктИРОВОЧНых кО ЁФФИцИЕНтОВ.

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Flynn, J.H. The isoconversional method for determination of energy of activation at constant heating rates. Journal of Thermal Analysis 27, 95–102 (1983). https://doi.org/10.1007/BF01907325

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  • DOI: https://doi.org/10.1007/BF01907325

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