Questions On Mixed Metal Oxides

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2.11.3 Mixed metal oxides
Despite the advantages of individual metal oxides, their CLC performance decreased with the increase of cycles due to the harsh CLC conditions. Therefore, the pure phase of mixed metal oxides and its supported form were prepared from the precursors and the selected support to overcome the limitations of individual metal oxides. The characteristics of individual metal oxides can be retained or even enhanced by mixing of appropriate individual oxides for CLC application in terms of multi-cycle CLC performance (cost, activity, stability, mechanical strength, reduction in carbon deposition, etc.).
The mixed oxide of Fe and Mn has been developed in our lab as a possible candidate for CLC. Fe-Mn mixed oxide possesses the promise as oxygen carrier for the CLC applications due to availability of low-cost minerals precursors, relatively high OCC, stability and environmentally benign nature. Mungse et al. reported the pure phase of iron-manganese oxides (FeMnO3 and Fe3Mn3O8) that exhibit CLOU property. It was found that Fe3Mn3O8 was reduced into FeMnO3 at higher temperatures. Fe3O4 and MnO were observed as reduced products after methane combustion reaction of FeMnO3 [25]. Nickel manganese oxides were also prepared for methane conversion [50].
CoO-NiO oxides were prepared as mixed oxide based oxygen carrier, however, the reaction rate was lower than that of its individual oxides due to the formation of a solid solution of NiCoO2. However, carbon deposition was
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