Reactivity Investigation on Iron-Titanium Oxides for a Moving Bed Chemical Looping Combustion Implementation

Diana C. Campos, Jamal Belkouch, Mourad Hazi, Aïssa Ould-Dris

Université de Technologie de Compiègne, Laboratoire de Transformation Intégrée de la Matière Renouvelable.
Université de Technologie de Compiègne, Laboratoire de Transformation Intégrée de la Matière Renouvelable,.

DOI: 10.4236/aces.2013.31005                

Abstract

Ilmenite-type natural ore which is constituted mainly of iron-titanium oxide is an interesting candidate as an oxygen carrier in chemical looping combustion (CLC) process. Its reactivity was investigated using methane as reducing gas and air as oxidizing gas. Experiments were carried out in a coupled thermogravimetric–thermo differential analyzer (TGA-DTA). When temperature increases from 700℃ to 1000℃, the reaction rate increases by 50 times while the oxygen transfer capacity passes from 1.8% to 12%. TG-DT analyses showed that the overall mass loss due to ilmenite reduction reached at most 12%. It corresponds to 87% of theoretical mass loss due to the transformation of Fe₂TiO₅ into Fe and TiO₂. It is established that the reduction for the iron-titanium oxides occurs in two steps: Fe₂TiO_5→ FeTiO_3→ Fe + TiO₂. The titanium reduction from the state TiO₂ to the stage Ti₃O₅ was observed as well. This behavior is supported by XRD analysis. Subsequent oxidation of the reduced mineral led to recover the starting oxide. The stability of iron-titanium oxides was established over 35 looping cycles of oxidation-reduction, with an increase of 5% of oxygen transfer capacity and reactivity in the first 5 cycles and after that, ilmenite reactivity remained constant. At high temperatures, catalytic effect of ilmenite on methane decomposition leading to carbon deposition is observed. The deposited carbon participates in the reactivity of the oxide.

Keywords

Ilmenite; Iron-Titanium Oxides; Chemical Looping Combustion; CLC; Methane; Reactivity

Conflicts of Interest

The authors declare no conflicts of interest.

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