The reactivity of TiO2 with different preparation histories in solid-state reactions in CaSO2-TiO2 systems |
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Authors: | T Ishii R Furuichi Y Ohshima |
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Institution: | (1) Department of Applied Chemistry, Faculty of Engineering, Hokkaido University, 060 Sapporo, Japan |
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Abstract: | Influences of the preparation histories of TiO2 on its reactivity in solid-state reactions in CaSO2-TiO2 systems were studied by means of TG, DTA and isothermal kinetic experiments.In order to estimate the reactivities of solids, it was necessary to note the behaviors in the initial reaction step in the selected reaction system. It was concluded that the reactivity of TiO2 was dependent on the structure difference due to the different preparation histories, and the greater the stability of the anatase form, up to higher temperature, the higher the reactivity of TiO2.
Zusammenfassung Der Einfluß der Herstellungsgeschichten von TiO2 auf seine Reaktivität bei der Festphasenreaktion im System CaSO4-TiO2 wurde durch TG, DTA und isotherme kinetische Versuche untersucht.Zur Abschätzung der Reaktivität der Festkörper mußte ihr Verhalten während des Anfangsschrittes der Reaktion im gewählten System beobachtet werden. Es wurde gefolgert, daß die Reaktivität des TiO2 von den durch verschiedene Herstellungsgeschichten verursachten Strukturdifferenzen abhängt und bis zu höheren Temperaturen umso stabiler in der Anatas-Form ist, je höher die Reaktivität des TiO2 ist.
Résumé On a étudié par TG, ATD et expériences cinétiques isothermes l'influence du mode de préparation de TiO2 sur sa réactivité lors de la réaction en phase solide des systèmes CaSO4-TiO2.Afin d'estimer la réactivité des solides, il a été nécessaire d'observer leurs comportements lors de l'étape initiale de la réaction dans le système réactionnel choisi. On en a conclu que la réactivité de TiO2 dépend des différences de structure dues aux différents modes de préparation et que ce composé est d'autant plus stable, à températures élevées, sous la forme d'anatase, que la réactivité de TiO2 est forte.
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![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![vcy](/content/t682h520t1105gw8/xxlarge1074.gif) ![lcy](/content/t682h520t1105gw8/xxlarge1083.gif) ![iecy](/content/t682h520t1105gw8/xxlarge1077.gif) ![ncy](/content/t682h520t1105gw8/xxlarge1085.gif) ![ycy](/content/t682h520t1105gw8/xxlarge1099.gif) ![rcy](/content/t682h520t1105gw8/xxlarge1088.gif) ![acy](/content/t682h520t1105gw8/xxlarge1072.gif) ![zcy](/content/t682h520t1105gw8/xxlarge1079.gif) ![lcy](/content/t682h520t1105gw8/xxlarge1083.gif) ![icy](/content/t682h520t1105gw8/xxlarge1080.gif) ![chcy](/content/t682h520t1105gw8/xxlarge1095.gif) ![ncy](/content/t682h520t1105gw8/xxlarge1085.gif) ![ycy](/content/t682h520t1105gw8/xxlarge1099.gif) ![mcy](/content/t682h520t1105gw8/xxlarge1084.gif) ![scy](/content/t682h520t1105gw8/xxlarge1089.gif) ![pcy](/content/t682h520t1105gw8/xxlarge1087.gif) ![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![scy](/content/t682h520t1105gw8/xxlarge1089.gif) ![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![bcy](/content/t682h520t1105gw8/xxlarge1073.gif) ![acy](/content/t682h520t1105gw8/xxlarge1072.gif) ![pcy](/content/t682h520t1105gw8/xxlarge1087.gif) ![rcy](/content/t682h520t1105gw8/xxlarge1088.gif) ![icy](/content/t682h520t1105gw8/xxlarge1080.gif) ![gcy](/content/t682h520t1105gw8/xxlarge1075.gif) ![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![tcy](/content/t682h520t1105gw8/xxlarge1090.gif) ![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![vcy](/content/t682h520t1105gw8/xxlarge1074.gif) ![lcy](/content/t682h520t1105gw8/xxlarge1083.gif) ![iecy](/content/t682h520t1105gw8/xxlarge1077.gif) ![ncy](/content/t682h520t1105gw8/xxlarge1085.gif) ![icy](/content/t682h520t1105gw8/xxlarge1080.gif) ![ncy](/content/t682h520t1105gw8/xxlarge1085.gif) ![acy](/content/t682h520t1105gw8/xxlarge1072.gif) ![icy](/content/t682h520t1105gw8/xxlarge1080.gif) ![bcy](/content/t682h520t1105gw8/xxlarge1073.gif) ![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![lcy](/content/t682h520t1105gw8/xxlarge1083.gif) ![iecy](/content/t682h520t1105gw8/xxlarge1077.gif) ![ucy](/content/t682h520t1105gw8/xxlarge1091.gif) ![scy](/content/t682h520t1105gw8/xxlarge1089.gif) ![tcy](/content/t682h520t1105gw8/xxlarge1090.gif) ![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![jcy](/content/t682h520t1105gw8/xxlarge1081.gif) ![chcy](/content/t682h520t1105gw8/xxlarge1095.gif) ![icy](/content/t682h520t1105gw8/xxlarge1080.gif) ![vcy](/content/t682h520t1105gw8/xxlarge1074.gif) ![fcy](/content/t682h520t1105gw8/xxlarge1092.gif) ![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![rcy](/content/t682h520t1105gw8/xxlarge1088.gif) ![mcy](/content/t682h520t1105gw8/xxlarge1084.gif) ![acy](/content/t682h520t1105gw8/xxlarge1072.gif) ![ncy](/content/t682h520t1105gw8/xxlarge1085.gif) ![acy](/content/t682h520t1105gw8/xxlarge1072.gif) ![tcy](/content/t682h520t1105gw8/xxlarge1090.gif) ![acy](/content/t682h520t1105gw8/xxlarge1072.gif) ![zcy](/content/t682h520t1105gw8/xxlarge1079.gif) ![vcy](/content/t682h520t1105gw8/xxlarge1074.gif) ![ycy](/content/t682h520t1105gw8/xxlarge1099.gif) ![scy](/content/t682h520t1105gw8/xxlarge1089.gif) ![kcy](/content/t682h520t1105gw8/xxlarge1082.gif) ![icy](/content/t682h520t1105gw8/xxlarge1080.gif) ![tcy](/content/t682h520t1105gw8/xxlarge1090.gif) ![iecy](/content/t682h520t1105gw8/xxlarge1077.gif) ![mcy](/content/t682h520t1105gw8/xxlarge1084.gif) ![pcy](/content/t682h520t1105gw8/xxlarge1087.gif) ![iecy](/content/t682h520t1105gw8/xxlarge1077.gif) ![rcy](/content/t682h520t1105gw8/xxlarge1088.gif) ![acy](/content/t682h520t1105gw8/xxlarge1072.gif) ![tcy](/content/t682h520t1105gw8/xxlarge1090.gif) ![ucy](/content/t682h520t1105gw8/xxlarge1091.gif) ![rcy](/content/t682h520t1105gw8/xxlarge1088.gif) ![acy](/content/t682h520t1105gw8/xxlarge1072.gif) ![gcy](/content/t682h520t1105gw8/xxlarge1075.gif) ![dcy](/content/t682h520t1105gw8/xxlarge1076.gif) ![bcy](/content/t682h520t1105gw8/xxlarge1073.gif) ![lcy](/content/t682h520t1105gw8/xxlarge1083.gif) ![iecy](/content/t682h520t1105gw8/xxlarge1077.gif) ![vcy](/content/t682h520t1105gw8/xxlarge1074.gif) ![ycy](/content/t682h520t1105gw8/xxlarge1099.gif) ![scy](/content/t682h520t1105gw8/xxlarge1089.gif) ![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![kcy](/content/t682h520t1105gw8/xxlarge1082.gif) ![acy](/content/t682h520t1105gw8/xxlarge1072.gif) ![rcy](/content/t682h520t1105gw8/xxlarge1088.gif) ![iecy](/content/t682h520t1105gw8/xxlarge1077.gif) ![acy](/content/t682h520t1105gw8/xxlarge1072.gif) ![kcy](/content/t682h520t1105gw8/xxlarge1082.gif) ![tscy](/content/t682h520t1105gw8/xxlarge1094.gif) ![icy](/content/t682h520t1105gw8/xxlarge1080.gif) ![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![ncy](/content/t682h520t1105gw8/xxlarge1085.gif) ![acy](/content/t682h520t1105gw8/xxlarge1072.gif) ![scy](/content/t682h520t1105gw8/xxlarge1089.gif) ![pcy](/content/t682h520t1105gw8/xxlarge1087.gif) ![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![scy](/content/t682h520t1105gw8/xxlarge1089.gif) ![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![bcy](/content/t682h520t1105gw8/xxlarge1073.gif) ![ncy](/content/t682h520t1105gw8/xxlarge1085.gif) ![ocy](/content/t682h520t1105gw8/xxlarge1086.gif) ![scy](/content/t682h520t1105gw8/xxlarge1089.gif) ![tcy](/content/t682h520t1105gw8/xxlarge1090.gif) TiO2.
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