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핵성장모델에 의한 산화철의 환원 메카니즘
Mechanism of Reduction of the Doped Hematite by Nucleation-Growth Model
HWAHAK KONGHAK, December 1984, 22(6), 307-316(10), NONE
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Abstract
수소에 의한 hematite의 저온환원과정에서 topochemical reaction에 따른 환원메카니즘을 고찰하기 위하여 핵성장모델과 모든 상변화단계를 고려한 extended-volume model에 기반을 둔 환원 반응속도식을 전개하였다.
Hematite의 환원에 있어서 첨가물의 효과에 관한 실험데이터를 환원속도식에 적용하여 속도 상수（βo）의 변화를 관찰하였다. 그 결과 βo는 일정한 수소기압하에서 산화철의 표면상태와 환원온도에 영향을 받음을 알 수 있었다.
Hematite의 환원에 있어서 첨가물의 효과에 관한 실험데이터를 환원속도식에 적용하여 속도 상수（βo）의 변화를 관찰하였다. 그 결과 βo는 일정한 수소기압하에서 산화철의 표면상태와 환원온도에 영향을 받음을 알 수 있었다.
Based on the nucleation-growth model and the extended-volume model with all the the steps of phase change, the rate equation was derived to clarify the reduction mechanism of topochemical reaction within hematite grains at low temperature.
The experimental data on the effect of additives for the reduction of hematite were applied to the equation and then the change of the rate constant（βo） was observed. It was found that the reduction rate constant(βo) was affected by the reduction temperature and the surface state of hematite under the constant H2 pressure.
The experimental data on the effect of additives for the reduction of hematite were applied to the equation and then the change of the rate constant（βo） was observed. It was found that the reduction rate constant(βo) was affected by the reduction temperature and the surface state of hematite under the constant H2 pressure.
