ガス成分を変調させた過渡応答熱分析法による膨張黒鉛の酸化予測

概要

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A novel transient thermal analysis for oxidation was developed in order to predict mass loss during oxidation of exfoliated graphite. The kinetics of oxidation were estimated from amount of CO and CO2 gas formation due to the response to pulsed feeding of reaction gas at the temperatures ranging from 500° to 800°C. This method enables carrying out gas-solid reactions with a controllable reaction progress at programmed temperature and without the effect of diffusion of reaction gas and formed gas on the kinetics of graphite oxidation. The method also provides the opportunity of simultaneous monitoring of changes in response to self-heating and calculating amount of burn-off ratio during oxidation. From oxidation rate as a function of oxidation temperature and burn-off ratio, and consideration of the diffusion effect of gases, mass loss of graphite can be estimated successfully by means of calculation using a differential-difference equation concerning oxidation rate under given temperature-programmed oxidation condition. The technique has beneficial features that the precise information about the oxidation can be obtained from only once test with one sample.
長崎大学の論文