摘要
应用等温和非等温热重分析法研究了 Co3O4的氢还原过程动力学,得出两种条件下过程均分为 Co3O4还原为 CoO和 CoO还原为 CO两个步骤, 二步骤均为界面化学反应控速在 523─603 K等温及 503─589 K非等温条件下, Co3O4还原为 CoO步骤的表观活化能均为 133 kJ/mol; 523—603 K等温还原 CoO为 Co步骤的表观活化能为 87.5 kJ/mol.
The kinetics of reduction of Co3O4 by hydrogen has been studied using the thermogravimetric technique isothermally and non-isothermally. It has been confirmed that the whole reduction process under both iso- and noniso-thermal conditions are composed of two interfacial chemical reaction controlled steps: the reduction of Co3O4 to CoO and CoO to Co. The activation energies of the reduction of Co3O4 to CoO obtained from isothermal TGA measurements in the range of 523603 K and from non-isothermal TGA measurements in the range of 503──589 K take the same value of 133 kJ/mol. The activation energy of the reduction of CoO to Co obtained from isothermal TGA measurements in the range of 523──603 K is 87.5 kJ/mol.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第8期837-841,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金资助项目!597740023