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题名: UV Raman Spectroscopic Studies on the Mechanism of FeAlPO4-5 Synthesis
作者: Guo Qiang1, 2;  Fan Fengtao1;  Guo Meiling1, 2;  Feng Zhaochi1;  Li Can1
关键词: iron ;  AlPO4-5 zeolite ;  UV Raman spectroscopy ;  resonance Raman effect ;  synthesis mechanism
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2012
DOI: 10.1016/S1872-2067(10)60281-1
卷: 33, 期:1, 页:106-113
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: FeAlPO4-5 samples with various iron contents were investigated by UV resonance Raman spectroscopy and UV-Vis spectroscopy. The Raman spectra of FeAlPO4-5 show four feature bands related to the framework iron at 630, 1060, 1140, and 1210 cm(-1) when excited by 266 nm laser. It is found that only part of ferric ions could enter into the framework, while the others exist in the extra-framework in the form of six-coordinated state. This kind of iron gives characteristic Raman band at 285 cm(-1). Combined with UV resonance Raman spectroscopy, UV-Vis spectroscopy, and X-ray diffraction, the crystallization process of FeAlPO4-5 (Al/Fe = 760) was studied. It is found that, in the early stages of the crystallization, the iron species exist in the form of six-coordinated state while attached to the end of the 1-dimensional AlPO4 chain. The Fe-O bonds in the six-coordinated state hamper the crystallization of AlPO4. The crystallization of the FeAlPO4-5 began when the reaction between the 1-dimensional AlPO4 chains occurred. At the same time, the six-coordinated ferric ions converted to the tetrahedral iron.
关键词[WOS]: SELECTIVE OXIDATION ;  MOLECULAR-SIEVES ;  ACTIVE-SITES ;  CRYSTALLIZATION MECHANISM ;  N2O DECOMPOSITION ;  NITROUS-OXIDE ;  TS-1 ZEOLITE ;  CATALYSTS ;  FRAMEWORK ;  TITANIUM
语种: 英语
WOS记录号: WOS:000300474100011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138022
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, State Key Lab Catalysis, Dalian Inst Chem Phys, Dalian 116023, Liaoning, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Guo Qiang,Fan Fengtao,Guo Meiling,et al. UV Raman Spectroscopic Studies on the Mechanism of FeAlPO4-5 Synthesis[J]. CHINESE JOURNAL OF CATALYSIS,2012,33(1):106-113.
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