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N2O decomposition over K-promoted Co-Al catalysts prepared from hydrotalcite-like precursors
Cheng, Hongkui1,2; Huang, Yanqiang1; Wang, Aiqin1; Li, Lin1; Wang, Xiaodong1; Zhang, Tao1; Zhang T(张涛)
关键词N2o Decomposition Alkali Metal Potassium Hydrotalcite
刊名APPLIED CATALYSIS B-ENVIRONMENTAL
2009-07-15
DOI10.1016/j.apcatb.2008.12.018
89期:3-4页:391-397
收录类别SCI
文章类型Article
部门归属15
项目归属1501
产权排名1;1
WOS标题词Science & Technology ; Physical Sciences ; Technology
类目[WOS]Chemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
研究领域[WOS]Chemistry ; Engineering
关键词[WOS]NITROUS-OXIDE ; SUPERIOR PERFORMANCE ; CO3O4 CATALYST ; METAL ; ZEOLITES ; SUPPORTS ; SPINEL ; OXYGEN ; GASES ; MG
英文摘要N2O decomposition was investigated over a series of K-promoted Co-Al catalysts. The activity tests showed that doping with K greatly enhanced the catalytic activity of the Co-Al catalyst, and the enhancement was critically dependent on the amount of K and the calcination temperature. When the catalyst had a K/Co atomic ratio of 0.04 and was calcined at 700-800 degrees C, a full N2O conversion could be reached at a reaction temperature of 300 degrees C. Moreover, even under the simultaneous presence of 4% O-2 and 2.6% water vapor, such high-temperature treated K/Co-Al catalyst exhibited high reactivity and stability, with the N2O conversion remaining at a constant value of 92% over 40 h run at 360 degrees C. In contrast, non-doped Co-Al catalyst showed a severe activity loss under such reaction conditions. A combination of characterization techniques was employed to reveal the promoting role of K and the effect of calcination temperature. The results suggest that doping with K increases the electron density of Co and weakens the Co-O bond, thus promoting the activation of N2O on the Co sites and facilitating the desorption of oxygen from the catalyst surface. High-temperature calcinations made the desorption of O-2 proceed more readily. (C) 2008 Elsevier B.V. All rights reserved.
语种英语
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WOS记录号WOS:000267203200011
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被引频次:44[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/102407
专题中国科学院大连化学物理研究所
通讯作者Zhang T(张涛)
作者单位1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
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Cheng, Hongkui,Huang, Yanqiang,Wang, Aiqin,et al. N2O decomposition over K-promoted Co-Al catalysts prepared from hydrotalcite-like precursors[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2009,89(3-4):391-397.
APA Cheng, Hongkui.,Huang, Yanqiang.,Wang, Aiqin.,Li, Lin.,Wang, Xiaodong.,...&张涛.(2009).N2O decomposition over K-promoted Co-Al catalysts prepared from hydrotalcite-like precursors.APPLIED CATALYSIS B-ENVIRONMENTAL,89(3-4),391-397.
MLA Cheng, Hongkui,et al."N2O decomposition over K-promoted Co-Al catalysts prepared from hydrotalcite-like precursors".APPLIED CATALYSIS B-ENVIRONMENTAL 89.3-4(2009):391-397.
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