Partial oxidation reforming of methane to synthesis gas by chemical-looping using CeO2-modified Fe2O3 as oxygen carrier
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Graphical Abstract
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Abstract
The CeO2/Fe2O3 oxygen carriers were prepared by co-precipitation method and their characterization was carried out using X-ray diffraction (XRD) and scanning electron microscope (SEM). The partial oxidation reforming of methane was tested in a fixed-bed at different operating conditions. The temperature programming results show that 30% CeO2-modified Fe2O3 has rather better effect than pure Fe2O3; the conversion of CH4, the selectivity of H2 and CO are greatly improved. Same results have been observed in isothermal experiments. As the reaction time is less than 1 200 s, there is no carbon deposit formed. After 15 cycles, 30% CeO2-modified Fe2O3 has the best cycling performance at 850 ℃ and the reaction time of 945 s. The conversion of CH4 reaches to 91.53%, the selectivity of H2 and CO reach to 86.36% and 85.12%, respectively and the H2/CO mol ratio in syngas is 2.03. The species of substance in oxygen carriers has no obvious change after 15 cycles.
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