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Multiple reaction scheme modelling

II parameter selection and re-examination of mutually independent first order reactions

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Abstract

A simple procedure whereby the energies of activation and pre-exponential factors of the individual reactions, of any kinetic model, comprising a wide variety of multiple reaction sets, is described. The sets belong to one of three classes, such that the single extent of reaction—temperature curves diverge, converge or are equally spaced at one prescribed temperature. The method has been applied to sets of first order reactions, which yield effectiven th order reactions with the order ‘n’varying from ∼0.6 to ∼ 3.0. Variations in Friedman iso-conversional reaction kinetics analytical data are indicative of the designed reaction complexity.

Zusammenfassung

Es wird ein einfaches Verfahren beschrieben, mit dessen Hilfe ausgehend von einer breiten Vielzahl von Mehrfachreaktionen die Aktivierungsenergien und die präexponentiellen Faktoren der Teilreaktionen eines beliebigen kinetischen Modells erhalten werden können. Die Mehrfachreaktionen gehören zu drei Typen, bei denen die einzelnen Reaktionsgrad—Temperatur-Kurven bei einer bestimmten Temperatur divergieren, konvergieren oder äquidistant sind. Das Verfahren wurde an Reihen von Reaktionen erster Ordnung angewendet, bei denen die Gesamtreaktionsordnungn Werte zwischen 0.6 und 3.0 hatte. Abweichungen in den kinetischen Isokonversionsdaten nach Friedman weisen auf die Komplexizität der betrachteten Reaktionen hin.

РЕжУМЕ

пОсРЕДстВОМ пРОстОг О МЕтОДА ЧЕРЕж ЁНЕРгИ И АктИВАцИИ И пРЕДЁксп ОНЕНцИАльНыЕ МНОжИтЕлИ ОтДЕльНых РЕАкцИИ, ОпИсАНА кИНЕ тИЧЕскАь МОДЕль, ОхВАтыВАУЩАь шИРОкИИ РьД МНОгОстУпЕНЧАтых РЕ АкцИОННых НАБОРОВ. Ёт И НАБОРы ОтНОсьтсь к ОДНОМУ Иж тРЕх клАссОВ, тАк ЧтО ЕДИНстВЕННАь МЕР А РЕАкцИИ — тЕМпЕРАтУ РНыЕ кРИВыЕ — РАсхОДьтсь, сБлИжАУ тсь ИлИ РАВНОМЕРНО РАспРЕДЕ лЕНы пО ИНтЕРВАлАМ пР И ОДНОИ пРЕДпИсАННОИ тЕМпЕР АтУРЕ. МЕтОД Был пРИМЕНЕН к НАБОРАМ РЕ АкцИИ пЕРВОгО пОРьДк А И пОжВОлИл пОлУЧИть ЁФФЕктИВНы Ип-ыИ пОРьДОк РЕАкцИИ с пОРьДкОМ “л ”, ИжМЕНьУЩИМсь От ∼0.6 Д О ∼3.0. ИжМЕНЕНИь АНАлИтИЧЕ скИх ДАННых В ИжО-кОНВЕРсИОННОИ РЕ АкцИОННОИ кИНЕтИкЕ Ф РИДМЁНА слУжИт пРИжНАкОМ слО жНОстИ РЕшАЕМОИ РЕАкцИИ.

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The author wishes to express his appreciation to the management of Merck and Co. for their continuing support of this extra-curricular program.

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Elder, J.P. Multiple reaction scheme modelling. Journal of Thermal Analysis 34, 1467–1484 (1988). https://doi.org/10.1007/BF01914371

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  • DOI: https://doi.org/10.1007/BF01914371

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