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Van Alboom, Antoine
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article
Fe2O3-MgAl2O4 for CO production from CO2 : Mössbauer spectroscopy and in situ X-ray diffraction
Abstract
Fe2O3/MgFeAlOx materials are promising oxygen storage candidates for chemical looping CO2 conversion. In this work, the cyclic stability of a 50Fe(2)O(3)/MgFeAlOx (containing 50 wt % Fe2O3 and 50 wt % MgAl2O4) oxygen storage material is investigated. The evolution of its bulk properties over the course of 1000 H-2/CO2 redox cycles has been studied by means of( 57)Fe Mossbauer spectroscopy and in situ X-ray diffraction. As expected, all iron in the as-prepared oxygen storage material was present as Fe3+, 64% of which in iron-rich phases alpha-Fe2O3 and alpha-FeOOH and 36% in the form of a MgFeAlOx spinel. In contrast, after 1000 redox cycles, only 19% of iron was present in an iron-rich spinel such as Fe3O4, gamma-Fe2O3, and MgFe2O4. The remaining 81% was present in the form of Mg-Fe-Al-O, including Mg-x Fe1-xO. ILEEMS measurements showed surface enrichment of Fe3+ in 50Fe(2)O(3)/MgFeAlOx after 1000 redox cycles, with 36% of all surface Fe present as Fe3+ in iron-rich spinel phases such as gamma-Fe2O3 and/or MgFe2O4.