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题名: A Thorough Investigation of the Active Titanium Species in TS-1 Zeolite by In Situ UV Resonance Raman Spectroscopy
作者: Guo, Qiang1, 2;  Sun, Keju1;  Feng, Zhaochi1;  Li, Guanna1;  Guo, Meiling1, 2;  Fan, Fengtao1;  Li, Can1
关键词: active centers ;  epoxidation ;  Raman spectroscopy ;  titanium ;  zeolites
刊名: CHEMISTRY-A EUROPEAN JOURNAL
发表日期: 2012-10-01
DOI: 10.1002/chem.201201319
卷: 18, 期:43, 页:13854-13860
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: A thorough investigation of the active titanium species in TS-1 zeolite was conducted by in situ UV resonance Raman spectroscopy combined with UV/Vis diffuse reflectance spectroscopy, DFT calculations, and epoxidation experiments. A new titanium species was identified with a characteristic Raman band at 695 cm-1 when excited at the 266 nm laser line. It is shown that the newly found titanium species is active in the epoxidation reactions in addition to the tetrahedrally coordinated titanium species. However, the acidity of the new titanium species could catalyze the ring-opening reactions of the epoxy products. It results in a lower selectivity toward the epoxy products relative to that of the tetrahedrally coordinated titanium species. The side reaction can be suppressed by the addition of a weak basic reagent.
关键词[WOS]: METAL-CATALYZED EPOXIDATION ;  HYDROGEN-PEROXIDE ;  AB-INITIO ;  TI-SILICALITE ;  STYRENE OXIDATION ;  ORGANIC HYDROPEROXIDES ;  SOLVENT ;  TI(IV) ;  REACTIVITY ;  DFT
语种: 英语
WOS记录号: WOS:000310066700036
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138027
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:
Guo, Qiang,Sun, Keju,Feng, Zhaochi,et al. A Thorough Investigation of the Active Titanium Species in TS-1 Zeolite by In Situ UV Resonance Raman Spectroscopy[J]. CHEMISTRY-A EUROPEAN JOURNAL,2012,18(43):13854-13860.
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