Abstract
The present study is concerned with the kinetics of carbon reduction of manganese oxide and the effect of hydrogen addition on this reduction process by the new technique, simultaneous measurement of evolved gas analysis (EGA) and the humidity sensor (HS). Water vapor evolved by the reduction with hydrogen was also detected by Humidity sensor. In the reduction process of MnO, manganese carbide was formed at an earlier stage of reduction, and the activation energy of 203kJ mol-1 nearly equal to that for Boudouard's reaction was obtained. As carbon was consumed entirely, the reaction between manganese oxide and it's carbide occurred to yield metallic phase.
It is concluded that the new technique, simultaneous measurement of EGA and HS is useful and trouble less tool for the high temperature reduction processes of active materials such as manganese oxides, as it's high vapor pressure and reactivity with silica tube for reaction vessel in an apparatus may lead to difficulties in measuring the kinetics of reduction processes.
