摘要
搜集并评估了氢气还原铁氧化物反应的表观活化能。分析了反应动力学条件与反应机理和表观活化能的关系。得出:气体内扩散控速和铁离子固态扩散控速时,还原过程的表观活化能分别为8.0~28.0 kJ/m ol和> 90 kJ/m ol;界面化学反应控速时,将Fe2O3,Fe3O4 和‘FeO’还原为Fe的表观活化能分别为40.0~70.0 kJ/m ol,55.0~65.0 kJ/m ol和42.0~52.0 kJ/m ol;两个环节混合控速时,表观活化能介于每个环节单独控速的表观活化能范围之间。
The apparent activation energies of reduction reactions of iron oxides by hydrogen are collected and assessed . The relations among the apparent activation energies , kinetic factors and mechanisms of the reactions are analyzed . The apparent activation energies assessed are : 8.0~28.0 kJ/mol and >90.0 kJ/mol for the reduction processes under gas intrinsic diffusion control and solid state iron ion diffusion control respectively; 40.0~70.0 kJ/mol, 55.0~65.0 kJ/mol and 42.0~52.0 kJ/mol for the reductions from Fe 2O 3, Fe 3O 4 and ‘FeO’ to Fe under interfacial chemical reaction control respectively. The ranges of the apparent activation energies of the reactions under mixed control of two steps are between the ranges of the two apparent activation energies if one of the two steps controls the reactions.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
1999年第6期9-13,共5页
Journal of Iron and Steel Research
基金
国家自然科学基金