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Iron oxide based catalysts: a temperature programmed reduction study

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Author Affiliations

  • 1Analytical Sciences, T&I, SABIC Research & Technology Pvt. Ltd, Plot No. 81 to 85, Chikkadunnasandra, Sarjapura - Attibele State Highway, Bengaluru, Karnataka-562125, India
  • 2Olefins Platform, SABIC Research & Technology Pvt. Ltd, Plot No. 81 to 85, Chikkadunnasandra, Sarjapura - Attibele State Highway, Bengaluru, Karnataka-562125, India

Res.J.chem.sci., Volume 11, Issue (3), Pages 39-45, October,18 (2021)

Abstract

Reduction process of iron oxides using hydrogen is a complex phenomena which needs to be understood properly to know about role of various phases of iron oxide in the functioning of catalyst. A detailed Temperature Programmed Reduction (TPR) study of iron oxide based catalyst has been reported here. Apart from fundamental behavior in terms of phase transformation as a result of reduction, the effect of various parameters like preparation methods, use of iron precursors, promoters and additives have also been studied in the present study. The reduction was found to be a multistage and stepwise process depending strongly on various factors like catalyst preparation method, iron precursor and presence of additives. This H2-TPR study further showed that, when Fe was more than 45%, reduction happened to be a three stage process (hematite Fe2O3 → magnetite Fe3O4 → wustite FeO →Fe), however when Fe is less than 30% it reduces through a two stage process (Fe2O3 → Fe3O4 → Fe). Also it was found that interaction of alumina (10%) with iron can make it possible to have reduction route through metastable FeO. However, with increasing Al content, alumina interacted strongly with iron oxide and resulted in the formation of spinel phase which was not easy to reduce. The presence of K and Mg in the catalyst shifted reduction towards high temperature.

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