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题名: Identifying the isolated transition metal ions/oxides in molecular sieves and on oxide supports by UV resonance Raman spectroscopy
作者: Li, C
关键词: UV Raman ;  resonance Raman ;  spectroscopy ;  isolated transition metal ions ;  transition metal oxides ;  selective oxidation ;  active sites ;  catalysts
刊名: JOURNAL OF CATALYSIS
发表日期: 2003-05-15
DOI: 10.1016/S0021-9517(02)00107-0
卷: 216, 期:1-2, 页:203-212
收录类别: SCI
文章类型: Article
部门归属: 503
项目归属: 503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Isolated transition metal ions/oxides in molecular sieves and on surfaces are a class of active sites for selective oxidation of hydrocarbons. Identifying the active sites and their coordination structure is vital to understanding their essential role played in catalysis and designing and synthesizing more active and selective catalysts. The isolated transition metal ions in the framework of molecular sieves (e.g., TS-1, Fe-ZSM-5, and V-MCM-41) or on the surface of oxides (e.g., MoO3/Al2O3 and TiO2/SiO2) were successfully identified by UV resonance Raman spectroscopy. The charge transfer transitions between the transition metal ions and the oxygen anions are excited by a UV laser and consequently the UV resonance Raman effect greatly enhances the Raman signals of the isolated transition metal ions. The local coordination of these ions in the rigid framework of molecular sieves or in the relatively flexible structure on the surface can also be differentiated by the shifts of the resonance Raman bands. The relative concentration of the isolated transition metal ion/oxides could be estimated by the intensity ratio of Raman bands. This study demonstrates that the UV resonance Raman spectroscopy is a general technique that can be widely applied to the in-situ characterization of catalyst synthesis and catalytic reactions. (C) 2003 Elsevier Science (USA). All rights reserved.
关键词[WOS]: TITANIUM SILICALITE-1 ;  COKE FORMATION ;  POWDER DIFFRACTION ;  MESOPOROUS MCM-41 ;  ZEOLITE ZSM-5 ;  GAMMA-ALUMINA ;  TS-1 ZEOLITE ;  LASER RAMAN ;  AB-INITIO ;  CATALYSTS
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000183226900019
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/82921
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

Recommended Citation:
Li, C. Identifying the isolated transition metal ions/oxides in molecular sieves and on oxide supports by UV resonance Raman spectroscopy[J]. JOURNAL OF CATALYSIS,2003,216(1-2):203-212.
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