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反应剂浓度非恒定条件下的两相反应动力学方程

殷群生 , 赵天从 , 钟廷科 , 林若娅

金属学报

对液、固两相反应中常见的二种反应类型,建立了同时包含有液相反应剂浓度和固相反应物几何面积随反应时间变化的动力学方程。应用此方程处理液、固两相反应比以往文献中不包含反应剂浓度变化的动力学方程准确合理。而且该方程原则上也适用于气、固两相反应。

关键词: 动力学方程 , heterogeneous reaction , reactant concentration , null

Kinetics of α-FeO(OH)Formation in Weak Acidic Medium

By ZHANG Yi WANG Yingxia HUA Tongwen Institute of Chemical Metallurgy , Academia Sinica , Beijing , 100080 , China.Department of Chemistry , Peking University , Beijing , 100871 , China.To whom correspondence should be addressed.

材料科学技术（英文）

The kinetics of α-FeO(OH) formation in weak acidic medium was studied.The effects of the initial concentration,temperature,pH value,partial pres- sure of oxygen,air flow rate and agitating intensity on the oxidation rate of Fe(OH)_2 suspensions have been investigated.It is confirmed that the reaction order for Fe(Ⅱ) is zero at the stage of α-FeO(OH) seeds formation,and about 0.5 at the stage of the seeds growth,and in the whole process partial pres- sure of oxygen appears in first order.The activation energy is determined.The dissolution-oxidation equilibrium which exists in the process of seeds formation has been suggested,by which the zero order reaction for Fe(Ⅱ) and the plateau in the pH-t curve were explained.Physical process is the rate-determining step of the heterogeneous reaction.The study on the kinetics of α-FeO(OH) formation may provide some fundamental informa- tion for the reactor design,the engineering amplifi- cation and the optimization control in the industrial process.

关键词: kinetics , null , null , null

KINETIC EQUATIONS WITH VARIATION OF LIQUID REACTANT CONCENTRATION

YIN Qunsheng ZHAO Tiancong ZHONG Tingke LIN Ruoya Central South University of Technology , Changsha , China YIN Qunsheng Lecturer Dept.of Metallurgy , Central South University of Technology Changsha 410083 , China

金属学报(英文版)

For two common types of liquid-solid heterogeneous reactions,the kinetic equations have been established which involved both the variation of liquid reactant concentration and the va- riation of solid reactant geornetry with the reaction time.The experimental results show that the kinetic equations are more accurate and reasonable than those appeared in previous litera- tures.Moreover,they are also suitable for gas-solid heterogeneous reactions in principle.

关键词: kinetic equation , null , null

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