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Identification of the chemical state of Fe in barium hexaaluminate using Rietveld refinement and Fe-57 Mossbauer spectroscopy
Zhu, Yanyan1,2; Wang, Xiaodong1; Wang, Aiqin1; Wu, Guotao1; Wang, Junhu1; Zhang, Tao1
KeywordHexaaluminate Chemical State Of Fe Rietveld Refinement Mossbauer Spectroscopy N2o Decomposition
Source PublicationJOURNAL OF CATALYSIS
2011-10-27
DOI10.1016/j.jcat.2011.08.001
Volume283Issue:2Pages:149-160
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Engineering, Chemical
WOS Research AreaChemistry ; Engineering
WOS KeywordTEMPERATURE CATALYTIC COMBUSTION ; NITROUS-OXIDE DECOMPOSITION ; DENSITY-FUNCTIONAL THEORY ; CRYSTAL-STRUCTURE ; BETA-ALUMINA ; N2O DECOMPOSITION ; PARTIAL OXIDATION ; SUBSTITUTED BA-BETA-AL2O3 ; CATION VALENCE ; METHANE
AbstractThe catalytic activity of hexaaluminate is closely related to the chemical state of substituted active metal ions. In this paper, the mechanism of stabilization of Fe ions in beta(1)-Al2O3 and magnetoplumbite-type Fe-substituted Ba hexaaluminates was proposed at the molecule level on the basis of X-ray diffraction, Rietveld refinement, and Mossbauer spectroscopy. Fe3+ ions originated from oxidic entities dispersed on Ba-modified gamma-Al2O3 mainly entered into the sites in the loosely packed mirror plane of the hexaaluminates. In particular, Fe3+ ions at low concentration preferentially occupied the tetrahedral Al(5) sites of the beta(1)-Al2O3 phase, while Fe3+ ions at high concentration mainly occupied the trigonal bipyramidal Al(5) and octahedral Al(3) sites in the magnetoplumbite phase. Meanwhile, tetrahedral Fe3+ ions in the intermediate spinel-type BaAl2O4 phase preferentially entered into the tetrahedral Al(2) sites in the spinel block of hexaaluminates. Fe ions in the Al(5) sites of beta(1)-Al2O3 and the Al(3) sites of magnetoplumbite phase were highly active for N2O decomposition. (C) 2011 Elsevier Inc. All rights reserved.
Language英语
WOS IDWOS:000296678500005
Citation statistics
Cited Times:28[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/142301
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
Zhu, Yanyan,Wang, Xiaodong,Wang, Aiqin,et al. Identification of the chemical state of Fe in barium hexaaluminate using Rietveld refinement and Fe-57 Mossbauer spectroscopy[J]. JOURNAL OF CATALYSIS,2011,283(2):149-160.
APA Zhu, Yanyan,Wang, Xiaodong,Wang, Aiqin,Wu, Guotao,Wang, Junhu,&Zhang, Tao.(2011).Identification of the chemical state of Fe in barium hexaaluminate using Rietveld refinement and Fe-57 Mossbauer spectroscopy.JOURNAL OF CATALYSIS,283(2),149-160.
MLA Zhu, Yanyan,et al."Identification of the chemical state of Fe in barium hexaaluminate using Rietveld refinement and Fe-57 Mossbauer spectroscopy".JOURNAL OF CATALYSIS 283.2(2011):149-160.
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