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学科主题: 物理化学
题名: Effect of Ir crystallographic site on the catalytic performance of Ir-substituted barium hexaferrites for N2O decomposition
作者: Zhu, Yanyan1, 2;  Wang, Xiaodong1;  Zhang, Yan1, 2;  Wang, Junhu1;  Huang, Yanqiang1;  Kappenstein, Charles3;  Zhang, Tao1
通讯作者: 王晓东 ;  张涛
关键词: Ir ;  Crystallographic site ;  Mossbauer spectroscopy ;  N2O decomposition
刊名: APPLIED CATALYSIS A-GENERAL
发表日期: 2011-12-15
DOI: 10.1016/j.apcata.2011.10.002
卷: 409, 期:待补充, 页:194-201
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 ;  Life Sciences & Biomedicine
类目[WOS]: Chemistry, Physical ;  Environmental Sciences
摘要: Effect of Ir crystallographic site on the catalytic performance of Ir-substituted barium hexaferrites for N2O decomposition
研究领域[WOS]: Chemistry ;  Environmental Sciences & Ecology
英文摘要: Ir-substituted barium hexaferrites (BaIrxFe12-xO19, x <= 0.6) were prepared using the carbonates route and investigated for high-concentration N2O decomposition. It was found that BaIrxFe12-xO19 offered a better dispersion of iridium by incorporating Ir into the hexaferrite structure. The crystallographic sites of Ir in BaIrxFe12-xO19 were identified through the analysis of Fe occupancy in the matrix by sensitive Fe-57 Mossbauer spectroscopy. Framework iridium preferentially occupied the octahedral sites in the order of 2a, 12k, and 4f(2) as increasing x value. When x = 0.1 and 0.4, the substitution of Ir for Fe3+ occurred in the 2a and 12k sites in the rigid spinel block with a comparable N2O decomposition activity, while this substitution in the 4f(2) sites in the mirror plane at x = 0.6 resulted in a remarkable enhancement of activity. Ir ions in the octahedral 4f(2) sites in the loosely packed mirror plane were highly active for N2O decomposition. (C) 2011 Elsevier B.V. All rights reserved.
关键词[WOS]: NITROUS-OXIDE ;  HEXAALUMINATE CATALYSTS ;  MOSSBAUER-SPECTROSCOPY ;  CRYSTAL-STRUCTURE ;  BETA-ALUMINA ;  COMBUSTION ;  METHANE ;  OXYGEN ;  OXIDATION ;  FE-ZSM-5
语种: 英语
WOS记录号: WOS:000298361900026
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/115805
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
3.Univ Poitiers, LACCO UMR CNRS 6503, Lab Catalyse Met, F-86022 Poitiers, France

Recommended Citation:
Zhu, Yanyan,Wang, Xiaodong,Zhang, Yan,et al. Effect of Ir crystallographic site on the catalytic performance of Ir-substituted barium hexaferrites for N2O decomposition[J]. APPLIED CATALYSIS A-GENERAL,2011,409(待补充):194-201.
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