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Potassium-doped Co3O4 catalyst for direct decomposition of N2O

2007; Elsevier BV; Volume: 78; Issue: 3-4 Linguagem: Inglês

10.1016/j.apcatb.2007.09.016

1873-3883

Kimihiro Asano, Chie Ohnishi, Shinji Iwamoto, Yasushi Shioya, Masashi Inoue,

Gas Sensing Nanomaterials and Sensors

Direct decomposition of nitrous oxide (N2O) on K-doped Co3O4 catalysts was examined. The K-doped Co3O4 catalyst showed a high activity even in the presence of water. In the durability test of the K-doped Co3O4 catalyst, the activity was maintained at least for 12 h. It was found that the activity of the K-doped Co3O4 catalyst strongly depended on the amount of K in the catalyst. In order to reveal the role of the K component on the catalytic activity, the catalyst was characterized by XRD, XPS, TPR and TPD. The results suggested that regeneration of the Co2+ species from the Co3+ species formed by oxidation of Co2+ with the oxygen atoms formed by N2O decomposition was promoted by the addition of K to the Co3O4 catalyst.