Double-perovskite type oxide LaSrFeCoO6was used as oxygen carrier for chemical looping steam methane reforming (CL-SMR) due to its unique structure and reactivity. Solid-phase, amorphous alloy, sol-gel and micro-emulsion methods were used to prepare the LaSrFeCoO6samples, and the as-prepared samples were characterized by means of X-ray diffraction (XRD), hydrogen temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) surface area. Results showed that the samples made by the four different methods exhibited pure crystalline perovskite structure. The ordered dou-ble perovskite LaSrFeCoO6was regarded as a regular arrangement of alternating FeO6and CoO6corner-shared octahedra, with La and Sr cations occupying thevoids in between the octahedral. Because the La3+and Sr2+ions in A-site didnot take part in reaction, the TPR patterns showedthe reductive properties of the B-site metals. The reduction peaks at low temperature revealed the reduction of adsorbed oxygenon surface and combined with the reduction of Co3+to Co2+and to Co0, while the reduction of Fe3+to Fe2+and the partial reduction of Fe2+to Fe0occurred at higher temperatures. From the point of view of the oxygen-donation ability, resistance to carbon formation, as well as hydrogen generation capacity, the sample made by micro-emulsion method exhibited the best reactiv-ity. Its redox reactivitywas very stable in ten successive cycles without deactivation. Compared to the single perovskite-type oxides LaFeO3and LaCoO3, the double perovskite LaSrFeCoO6exhibitedbetter syngas and hydrogen generation capacity.
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