CO2 decomposition with mangano-wüstite
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Mn(II)-ferrite (Mn0.97Fe2.02O4.00) prepared by the wet method was reduced in a hydrogen at 300°C to form highly reactive mangano-wüstite ((Fe0.67, Mn0.32)O) for CO2 decomposition. Approximately 23% CO2 injected (3.40 mmol) was decomposed to CO by the mangano-wüstite (3.22 g) in the initial stage of the reaction in a batch system at 400°C. 88% CO was further decomposed to carbon. Approximately 58% CO2 injected was reversibly adsorbed on the surface and the remaining 12% was unchanged after 200 h reaction. The mangano-wüstite was concurrently transformed to Mn(II)-bearing ferrite (Mn0.23Fe2.77O4.00) and manganeserich mangano-wüstite ((Fe0.60, Mn0.40)O). The higher CO2 decomposition capacity for this mangano-wüstite than that for oxygen-deficient Mn(II)-ferrite is discussed in detail, based on electron hopping and movement of ions in the bulk.
KeywordsHydrogen Polymer Ferrite Material Processing Batch System
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