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题名: Characterization of Fe Substitution into La-Hexaaluminate Systems and the Effect on N2O Catalytic Decomposition
作者: Zhang, Yan1, 2;  Wang, Xiaodong1;  Zhu, Yanyan3;  Hou, Baolin1;  Yang, Xiaofeng1;  Liu, Xin1;  Wang, Junhu1;  Li, Jun4;  Zhang, Tao1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2014-01-30
DOI: 10.1021/jp410207d
卷: 118, 期:4, 页:1999-2010
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Compared to Ba-hexaaluminates with beta-Al2O3 structure, La-hexaaluminates with magnetoplumbite (MP) structure have more substituted Al sites in the preferentially exposed mirror plane, which should favor N2O decomposition. In this regard, LaFexAl12-xO19 catalysts with x = 1 and 5 were herein prepared using the coprecipitation method. Fe-57 Mossbauer spectroscopy and X-ray diffraction structure refinements revealed that Fe3+ ions originating in Fe2O3 species mainly entered tetrahedral Al(2) and trigonal bipyramidal Al(5) sites. Meanwhile, Fe3+ ions in octahedral sites of perovskite-type LaFeO3 intermediates preferentially accommodated in octahedral Al(3) sites in the mirror plane of La-hexaaluminates. Correlation of normalized rates (moles of N2O per hour per square meter) of the catalysts at 500 degrees C with the occupancy of Fe ions in different Al crystallographic sites of the MP phase indicated that Fe3+ ions in the Al(3) and Al(5) sites were highly active for N2O decomposition. In contrast, Fe2+ derived from a Fe3+ -> Fe2+ reduction under high-temperature calcination played a negative role.
关键词[WOS]: INITIO MOLECULAR-DYNAMICS ;  TOTAL-ENERGY CALCULATIONS ;  PEROVSKITE-TYPE OXIDES ;  AUGMENTED-WAVE METHOD ;  X-RAY-DIFFRACTION ;  CRYSTAL-STRUCTURE ;  BARIUM HEXAALUMINATE ;  BETA-ALUMINA ;  CRYSTALLOGRAPHIC SITES ;  PARTIAL OXIDATION
语种: 英语
WOS记录号: WOS:000330610200029
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145684
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.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.NW Univ Xian, Coll Chem Engn, Xian 710069, Peoples R China
4.Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China

Recommended Citation:
Zhang, Yan,Wang, Xiaodong,Zhu, Yanyan,et al. Characterization of Fe Substitution into La-Hexaaluminate Systems and the Effect on N2O Catalytic Decomposition[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2014,118(4):1999-2010.
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