| Kinetics of Fe_3O_4 formation by air oxidation |
| |
| 作者姓名： | 杨喜云 龚竹青 刘丰良 |
| |
| 作者单位： | School of Metallurgical Science and Engineering，Central South University，School of Metallurgical Science and Engineering，Central South University，School of Metallurgical Science and Engineering，Central South University Changsha 410083，China，Changsha 410083，China，Changsha 410083，China |
| |
| 摘 要： | 1 INTRODUCTIONFe3O4 hasanumberofnovelpropertiesandper formances ,itsuniquemagnetic ,thermalandtribolog icalpropertiesmakeitanewtypeofmaterialspromis inginvariousapplicationssuchaspigment,toner ,in formationstorage ,ferrofluids ,bioprocessing ,elec tronicsandcatalyst1,2 ] .Owingtothewideapplica tion ,majorityofresearchersfocusedontheprepara tionmethodsofmagnetite310 ] ,however ,themech anismandkineticsofFe3O4 formationwerescarcelystudied .Thekineticsandmechanismofoxyhydrox idesformatio…
|
Kinetics of Fe3O4 formation by air oxidation |
| |
| YANG Xi-yun,GONG Zhu-qing,LIU Feng-liang.Kinetics of Fe_3O_4 formation by air oxidation[J].Journal of Central South University of Technology,2004,11(2). |
| |
| Authors: | YANG Xi-yun GONG Zhu-qing LIU Feng-liang |
| |
| Abstract: | The kinetics of Fe3O4 formation by air oxidation of slightly acidic suspension of Fe(OH)2 was studied. The effects of initial concentration of Fe(Ⅱ), temperature, partial pressure of oxygen, air flow rate and stirring rate on the oxidation rate were investigated. The results show that Fe3O4 formation is composed of two-step reaction, the first step is the formation of Fe(OH) 2 by oxidation of Fe(OH) complex ions, the second step is the formation of magnetite by dehydration and deprotonation of Fe(OH) and Fe(OH) 2. The oxidation reaction is zero-order with respect to the concentration of Fe(Ⅱ) and around 0.5-order with respect to partial pressure of oxygen, and oxygen transfer process is rate-limiting step of oxidation reaction with apparent activation energy of 2.74 kJ·mol-1. |
| |
| Keywords: | Fe3O4 kinetics air oxidation |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
