Thermal investigation of active carbons in presence of air |
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Authors: | J. M. Skowroński |
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Affiliation: | (1) Institute of New Energy Conversion, Academy of Mining and Metallurgy, Pozna , Poland;(2) Present address: Institute of General Chemistry, Poznan Technical University, 60-965 Poznan, Poland |
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Abstract: | Thermal analysis data on the oxidation reaction between air and active carbons obtained during activation by carbon dioxide are presented. The correlation between the modified DTA curves and the TG curves leads to the conclusion that the oxidation of active carbons in the temperature range from 20 to 1000° is a two-step process. It is pointed out that the oxidation reactions in the low-temperature region (450–550°) are governed by the oxygen content of the samples, whereas the reactions in the higher temperature region (550–850°) are controlled by the diffusion process.
Zusammenfassung Die thermoanalytischen Ergebnisse über die während der Aktivierung durch Kohlendioxid stattfindende Oxidationsreaktion zwischen Luft und Aktivkohlen werden vorgestellt. Die Korrelation zwischen den modifizierten DTA-Kurven und den TG-Kurven führte zur Schlußfolgerung, daß die Oxidation der Aktivkohlen im Temperaturbereich von 20 bis 1000° ein Zweistufen-Vorgang ist. Es wird betont, daß die Oxidationsreaktion im niedrigen Temperaturbereich (450 bis 550°) durch den Sauerstoffgehalt der Proben gesteuert wird, während er im Bereich der höheren Temperaturen (550 bis 850°) durch Diffusionsvorgänge geregelt wird.
Résumé On présente les résultats de l'étude par analyse thermique de la réaction d'oxydation des charbons actifs par l'air qui a lieu lors de l'activation par l'anhydride carbonique. La corrélation entre les courbes ATD modifiées et les courbes TG conduit à la conclusion que l'oxydation des charbons actifs s'effectue entre 20 et 1000°, suivant un processus en deux étapes. Dans l'intervalle des températures faibles (450 à 550°) les réactions d'oxydation sont gouvernées par la teneur en oxygène des échantillons tandis qu aux températures plus élevées (550 à 850°) elles le sont par le processus de diffusion.
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![icy](/content/q0k31n012145r132/xxlarge1080.gif) ![kcy](/content/q0k31n012145r132/xxlarge1082.gif) ![icy](/content/q0k31n012145r132/xxlarge1080.gif) ![scy](/content/q0k31n012145r132/xxlarge1089.gif) ![lcy](/content/q0k31n012145r132/xxlarge1083.gif) ![ocy](/content/q0k31n012145r132/xxlarge1086.gif) ![rcy](/content/q0k31n012145r132/xxlarge1088.gif) ![dcy](/content/q0k31n012145r132/xxlarge1076.gif) ![ocy](/content/q0k31n012145r132/xxlarge1086.gif) ![bcy](/content/q0k31n012145r132/xxlarge1073.gif) ![rcy](/content/q0k31n012145r132/xxlarge1088.gif) ![acy](/content/q0k31n012145r132/xxlarge1072.gif) ![zcy](/content/q0k31n012145r132/xxlarge1079.gif) ![tscy](/content/q0k31n012145r132/xxlarge1094.gif) ![acy](/content/q0k31n012145r132/xxlarge1072.gif) , ![tcy](/content/q0k31n012145r132/xxlarge1090.gif) ![vcy](/content/q0k31n012145r132/xxlarge1074.gif) ![rcy](/content/q0k31n012145r132/xxlarge1088.gif) ![iecy](/content/q0k31n012145r132/xxlarge1077.gif) ![mcy](/content/q0k31n012145r132/xxlarge1084.gif) ![kcy](/content/q0k31n012145r132/xxlarge1082.gif) ![vcy](/content/q0k31n012145r132/xxlarge1074.gif) ![ycy](/content/q0k31n012145r132/xxlarge1099.gif) ![scy](/content/q0k31n012145r132/xxlarge1089.gif) ![ocy](/content/q0k31n012145r132/xxlarge1086.gif) ![kcy](/content/q0k31n012145r132/xxlarge1082.gif) ![ocy](/content/q0k31n012145r132/xxlarge1086.gif) ![tcy](/content/q0k31n012145r132/xxlarge1090.gif) ![iecy](/content/q0k31n012145r132/xxlarge1077.gif) ![mcy](/content/q0k31n012145r132/xxlarge1084.gif) ![pcy](/content/q0k31n012145r132/xxlarge1087.gif) ![iecy](/content/q0k31n012145r132/xxlarge1077.gif) ![rcy](/content/q0k31n012145r132/xxlarge1088.gif) ![acy](/content/q0k31n012145r132/xxlarge1072.gif) ![tcy](/content/q0k31n012145r132/xxlarge1090.gif) ![ucy](/content/q0k31n012145r132/xxlarge1091.gif) ![rcy](/content/q0k31n012145r132/xxlarge1088.gif) ![ncy](/content/q0k31n012145r132/xxlarge1085.gif) ![ocy](/content/q0k31n012145r132/xxlarge1086.gif) ![bcy](/content/q0k31n012145r132/xxlarge1073.gif) ![lcy](/content/q0k31n012145r132/xxlarge1083.gif) ![acy](/content/q0k31n012145r132/xxlarge1072.gif) ![scy](/content/q0k31n012145r132/xxlarge1089.gif) ![tcy](/content/q0k31n012145r132/xxlarge1090.gif) (550–850°) ![rcy](/content/q0k31n012145r132/xxlarge1088.gif) ![iecy](/content/q0k31n012145r132/xxlarge1077.gif) ![acy](/content/q0k31n012145r132/xxlarge1072.gif) ![kcy](/content/q0k31n012145r132/xxlarge1082.gif) ![tscy](/content/q0k31n012145r132/xxlarge1094.gif) ![icy](/content/q0k31n012145r132/xxlarge1080.gif) ![ocy](/content/q0k31n012145r132/xxlarge1086.gif) ![pcy](/content/q0k31n012145r132/xxlarge1087.gif) ![rcy](/content/q0k31n012145r132/xxlarge1088.gif) ![iecy](/content/q0k31n012145r132/xxlarge1077.gif) ![dcy](/content/q0k31n012145r132/xxlarge1076.gif) ![iecy](/content/q0k31n012145r132/xxlarge1077.gif) ![lcy](/content/q0k31n012145r132/xxlarge1083.gif) ![yacy](/content/q0k31n012145r132/xxlarge1103.gif) ![yucy](/content/q0k31n012145r132/xxlarge1102.gif) ![tcy](/content/q0k31n012145r132/xxlarge1090.gif) ![scy](/content/q0k31n012145r132/xxlarge1089.gif) ![dcy](/content/q0k31n012145r132/xxlarge1076.gif) ![icy](/content/q0k31n012145r132/xxlarge1080.gif) ![fcy](/content/q0k31n012145r132/xxlarge1092.gif) ![fcy](/content/q0k31n012145r132/xxlarge1092.gif) ![ucy](/content/q0k31n012145r132/xxlarge1091.gif) ![icy](/content/q0k31n012145r132/xxlarge1080.gif) ![ocy](/content/q0k31n012145r132/xxlarge1086.gif) ![ncy](/content/q0k31n012145r132/xxlarge1085.gif) ![ncy](/content/q0k31n012145r132/xxlarge1085.gif) ![ycy](/content/q0k31n012145r132/xxlarge1099.gif) ![pcy](/content/q0k31n012145r132/xxlarge1087.gif) ![rcy](/content/q0k31n012145r132/xxlarge1088.gif) ![ocy](/content/q0k31n012145r132/xxlarge1086.gif) ![tscy](/content/q0k31n012145r132/xxlarge1094.gif) ![iecy](/content/q0k31n012145r132/xxlarge1077.gif) ![scy](/content/q0k31n012145r132/xxlarge1089.gif) ![scy](/content/q0k31n012145r132/xxlarge1089.gif) ![ocy](/content/q0k31n012145r132/xxlarge1086.gif) .
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