Thermal decomposition of CaC2O4 · H2O. Determination of kinetic parameters by DTG and DTA |
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Authors: | S Gurrieri G Siracusa R Calí |
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Institution: | (1) Institute of General and Inorganic Chemistry, University of Catania, 95125, Italy |
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Abstract: | The thermal decomposition of CaC2O4 · H2O is studied in air and in a nitrogen atmosphere. The influence of the environment on the DTA curves is discussed. The activation energies and the frequency factors of the three reactions occurring in this decomposition have been determined by application of Kissinger's equations to the DTG curves and, for comparison, to the simultaneous DTA curves. DTG, unlike DTA, may be applied to a reaction: solid A=solid B + gas C when another transformation involving only enthalpy change is also occurring at the same time.
Zusammenfassung Die thermische Zersetzung von CaC2O4 · H2O wurde in Luft und in Stickstoffatmosphäre untersucht. Der Einfluß der Umgebung auf die DTA-Kurven wird erörtert. Die Aktivierungsenergie und der Frequenzfaktor der drei Reaktionen, welche bei dieser Zersetzung einen entsprechenden Einfluß haben, wurden an Hand der für DTG-Kurven angewandten Kissinger Gleichungen ermittelt und, für Vergleichszwecke, auch für die simultan erhaltenen DTA-Kurven berechnet. Im Gegensatz zu DTA kann DTG für Reaktionen der Form A Feststoff=B Feststoff + C Gas angewandt werden, selbst wenn sich gleichzeitig eine andere, nur Enthalpieänderungen erfordernde Umwandlung abspielt.
Résumé On a étudié la décomposition thermique de CaC2O4· H2O dans l'air et dans l'azote et l'on discute le rôle de l'atmosphère sur les courbes ATD.On détermine l'énergie d'activation et le facteur de fréquence des trois réactions successives de la décomposition à l'aide des équations de Kissinger appliquées aux courbes TGD ainsi qu'aux courbes ATD obtenues simultanément.La TGD, contrairement à l'ATD, peut s'appliquer à une réaction du type solide A= =solide B + gaz C, même lorsqu'une autre réaction, ne mettant en jeu que des variations d'enthalpie, s'effectue simultanément.
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![ocy](/content/k785175w5q733836/xxlarge1086.gif) ![vcy](/content/k785175w5q733836/xxlarge1074.gif) ![ocy](/content/k785175w5q733836/xxlarge1086.gif) ![zhcy](/content/k785175w5q733836/xxlarge1078.gif) ![dcy](/content/k785175w5q733836/xxlarge1076.gif) ![acy](/content/k785175w5q733836/xxlarge1072.gif) ![yucy](/content/k785175w5q733836/xxlarge1102.gif) ![shchcy](/content/k785175w5q733836/xxlarge1097.gif) ![iecy](/content/k785175w5q733836/xxlarge1077.gif) ![iecy](/content/k785175w5q733836/xxlarge1077.gif) ![scy](/content/k785175w5q733836/xxlarge1089.gif) ![tcy](/content/k785175w5q733836/xxlarge1090.gif) ![lcy](/content/k785175w5q733836/xxlarge1083.gif) ![softcy](/content/k785175w5q733836/xxlarge1100.gif) ![kcy](/content/k785175w5q733836/xxlarge1082.gif) ![icy](/content/k785175w5q733836/xxlarge1080.gif) ![zcy](/content/k785175w5q733836/xxlarge1079.gif) ![mcy](/content/k785175w5q733836/xxlarge1084.gif) ![iecy](/content/k785175w5q733836/xxlarge1077.gif) ![ncy](/content/k785175w5q733836/xxlarge1085.gif) ![iecy](/content/k785175w5q733836/xxlarge1077.gif) ![ncy](/content/k785175w5q733836/xxlarge1085.gif) ![icy](/content/k785175w5q733836/xxlarge1080.gif) ![iecy](/content/k785175w5q733836/xxlarge1077.gif) ![ecy](/content/k785175w5q733836/xxlarge1101.gif) ![ncy](/content/k785175w5q733836/xxlarge1085.gif) ![tcy](/content/k785175w5q733836/xxlarge1090.gif) ![lcy](/content/k785175w5q733836/xxlarge1083.gif) ![softcy](/content/k785175w5q733836/xxlarge1100.gif) ![pcy](/content/k785175w5q733836/xxlarge1087.gif) ![icy](/content/k785175w5q733836/xxlarge1080.gif) .
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