Abstract
Fe supported on activated carbons treated by HNO3 (Fe/NAC) was prepared using the incipient wetness method with ultrasonic-assisted oscillation and calcined at different temperatures. The physical and chemical properties were studied using FTIR, XPS, XRD and H2-TPR, and SO2 removal ability of Fe/NAC was also evaluated at a fixed bed. The results showed that α-Fe2O3 and small Fe3O4 coexist in Fe/NAC-500, while catalysts calcined at 700 °C only possess Fe3O4. Fe3O4 with small Fe2SiO4 is observed for Fe/NAC-900, but Fe2SiO4 and Fe0 are detected in Fe/NAC-1000, indicating that the interactions between Fe precursor and activated carbons are very complex, and C atoms may take part in the reduction of iron oxides. The relative content of C–C and C–O decreases first and then increases when calcination temperatures increase from 500 to 1000 °C, but that of C═O and O═C—OH has a contrary trend, suggesting that calcination temperatures influence the formation of functional groups. Fe/NAC-900 shows the best activity a...
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