{"title":"Kinetics of the cracking reduction of hematite","authors":"F. Adam, F. Jeannot, B. Dupré, C. Gleitzer","doi":"10.1016/0168-7336(89)80060-9","DOIUrl":null,"url":null,"abstract":"<div><p>The cracking of hematite crystals during their low-temperature reduction to magnetite raises the question of the analysis of sigmoidal kinetic curves after an induction period which may be prolonged.</p><p>We have recorded such curves with CO/CO<sub>2</sub> = <span><math><mtext>20</mtext><mtext>80</mtext></math></span> from 350 to 600 °C, and used different models: - the classical Shrinking Core Model which should apply only at 600 ° C and not below, - the Crackling Core Model, except for at the beginning of reaction.</p><p>Surprisingly these models each yield values for the rate constant and its activation energy which are in reasonable agreement.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 4","pages":"Pages 399-408"},"PeriodicalIF":0.0000,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80060-9","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Reactivity of Solids","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0168733689800609","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
The cracking of hematite crystals during their low-temperature reduction to magnetite raises the question of the analysis of sigmoidal kinetic curves after an induction period which may be prolonged.
We have recorded such curves with CO/CO2 = from 350 to 600 °C, and used different models: - the classical Shrinking Core Model which should apply only at 600 ° C and not below, - the Crackling Core Model, except for at the beginning of reaction.
Surprisingly these models each yield values for the rate constant and its activation energy which are in reasonable agreement.
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