Low temperature CO oxidation from sintering flue gas on CuO-CeO2/AC-Fe catalyst

The effects of carbon-iron composite (AC-Fe) on the performance of CO oxidation for CuO-CeO2 catalyst in sintering flue gas are investigated by XRD, H2-TPR, Raman, XPS, FTIR, CO-TPD and SEM. The results show that the AC-Fe can effectively increase the catalytic activity of CuO-CeO2. CuO-CeO2/AC-Fe catalyst with Fe/AC mass ratio of 0.03 achieves the highest activity, corresponding to complete CO conversion at 160 ºC. The defects and oxygen-containing functional groups on AC-Fe can anchor the active particles to inhibit grain growth and facilitate the dispersity of active components. In addition, the Fe species incorporate into CeO2 lattice, resulting in the increase of Ce3+ species and the generation of more oxygen vacancy on catalyst, which can enhance the mobility of reactive oxygen species and the redox property. Moreover, the increase of Cu+ on the catalyst provides more active sites for CO adsorption.