Catalytic decomposition of N2O over CeO2 promoted CO3O4 spinel catalyst
Catalytic decomposition of N2O over CeO2 promoted CO3O4 spinel catalyst
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DOI：
10.1016/j.apcatb.2007.04.013
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发表时间：
2007-09
影响因子：
22.1
通讯作者：
Li Xue;Changbin Zhang;Hong He;Y. Teraoka
中科院分区：
文献类型：
--
作者：
Li Xue;Changbin Zhang;Hong He;Y. Teraoka
采用共沉淀法制备了一系列CeO 2改性的钴尖晶石催化剂，并对N2 O分解反应进行了考察。在Co 3 O 4中添加CeO 2可提高催化剂的N2 O分解活性。当Ce/Co摩尔比为0.05左右时，催化剂的活性最高。采用XRD、FE-SEM、BET、XPS、H2-TPR和O2-TPD等方法对催化剂进行了表征。分析结果表明，CeO 2的加入增加了Co 3 O 4的比表面积，促进了N2 O在钴尖晶石催化剂上分解的速率控制步骤--吸附氧物种的脱附，从而促进了Co 3+还原为Co2+的反应。我们的结论是，这些影响，所造成的添加CeO 2，负责Co 3 O 4的催化活性的增强。
A series of CeO2promoted cobalt spinel catalysts were prepared by the co-precipitation method and tested for the decomposition of nitrous oxide (N2O). Addition of CeO2to Co3O4led to an improvement in the catalytic activity for N2O decomposition. The catalyst was most active when the molar ratio of Ce/Co was around 0.05. Complete N2O conversion could be attained over the CoCe0.05 catalyst below 400°C even in the presence of O2, H2O or NO. Methods of XRD, FE-SEM, BET, XPS, H2-TPR and O2-TPD were used to characterize these catalysts. The analytical results indicated that the addition of CeO2could increase the surface area of Co3O4, and then improve the reduction of Co3+to Co2+by facilitating the desorption of adsorbed oxygen species, which is the rate-determining step of the N2O decomposition over cobalt spinel catalyst. We conclude that these effects, caused by the addition of CeO2, are responsible for the enhancement of catalytic activity of Co3O4.