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题名: N2O decomposition over K-promoted Co-Al catalysts prepared from hydrotalcite-like precursors
作者: Cheng, Hongkui1, 2;  Huang, Yanqiang1;  Wang, Aiqin1;  Li, Lin1;  Wang, Xiaodong1;  Zhang, Tao1
通讯作者: 张涛
关键词: N2O decomposition ;  Alkali metal ;  Potassium ;  Hydrotalcite
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
发表日期: 2009-07-15
DOI: 10.1016/j.apcatb.2008.12.018
卷: 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
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.
关键词[WOS]: NITROUS-OXIDE ;  SUPERIOR PERFORMANCE ;  CO3O4 CATALYST ;  METAL ;  ZEOLITES ;  SUPPORTS ;  SPINEL ;  OXYGEN ;  GASES ;  MG
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000267203200011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/102407
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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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

Recommended Citation:
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.
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