Effect of precipitants on the catalytic activity of Co–Ce composite oxide for N2O catalytic decomposition

摘要: Co–Ce composite oxide catalysts have been prepared by the co-precipitation method using K2CO3 (Co–Ce–A), KOH (Co–Ce–B) and NH3·H2O (Co–Ce–C) as precipitants. The effect of different precipitants on catalytic activity for N2O decomposition was investigated in a fixed-bed continuous flow reactor. structure properties were characterized XRD, TEM, FT-IR, Raman, XRF, BET, EC, H2-TPR O2-TPD. results show that under reaction conditions 0.1% GHSV 10,000 h−1, the catalyst precipitant exhibits better than or precipitant. TEM BET reveal all samples exist Co3O4 phase with spinel though precipitated precursors are different, while Co–Ce–A shows higher specific surface area smaller crystalline size. Further characterizations suggest compared Co–Ce–B Co–Ce–C, possesses not only stronger interaction between Co Ce species, but also electrical conductivity resulting from more amount residual K, which improves reduction Co3+–Co2+ facilitates desorption oxygen species. Therefore, enhanced activity.