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题名: Effect of large cations (La3+ and Ba2+) on the catalytic performance of Mn-substituted hexaaluminates for N2O decomposition
作者: Tian, Ming1, 2;  Wang, Aiqin1;  Wang, Xiaodong1;  Zhu, Yanyan1, 2;  Zhang, Tao1
关键词: N2O decomposition ;  Propellant ;  Manganese ;  Hexaaluminate
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
发表日期: 2009-11-09
DOI: 10.1016/j.apcatb.2009.09.002
卷: 92, 期:3-4, 页:437-444
收录类别: SCI
文章类型: Article
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: Mn-substituted La-hexaaluminate (LaMnxAl(12-x)O19) and Ba-hexaaluminate (BaMnxAl(12-x)O19) catalysts were prepared using the carbonates route and investigated for high-concentration of N2O decomposition. it was for the first time found that the Ba-hexaaluminate exhibited higher activity than the La-hexaaluminate at a given Mn content, both of which were much more active than Mn/Al2O3 after being subjected to high-temperature (1400 degrees C) treatment. The catalytic activity varied with the Mn content and attained the best one at x = 1. X-ray diffraction (XRD) characterizations showed that a small amount of Mn (up to x = 1) promoted greatly the formation of phase-pure hexaaluminate, while excess Mn caused formation of catalytically inactive impurity phases, such as LaAlO3, BaAl2O4, Mn3O4, and LaMnO3, which covered partially the active sites and then led to a loss of the activity. UV-visible spectra showed that Mn2+ preferentially enter tetrahedral Al sites at a low Mn content (x = 0.5) for the La-hexaaluminate, which is quite different from the case of Ba-hexaaluminate where Mn3+ can substitute octahedral Al sites even at x = 0.5. Such a difference in the number of catalytically active Mn3+ sites in the octahedral position should be responsible for the higher activity of the Mn-substituted Ba-hexaaluminate. (C) 2009 Elsevier B.V. All rights reserved.
关键词[WOS]: PARTIAL OXIDATION ;  CRYSTAL-STRUCTURE ;  COMBUSTION ;  METHANE ;  OXIDES ;  BA-BETA-AL2O3 ;  MICROCRYSTALS ;  PROPELLANT ;  CONVERSION ;  STABILITY
语种: 英语
WOS记录号: WOS:000271664100026
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141536
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:
Tian, Ming,Wang, Aiqin,Wang, Xiaodong,et al. Effect of large cations (La3+ and Ba2+) on the catalytic performance of Mn-substituted hexaaluminates for N2O decomposition[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2009,92(3-4):437-444.
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