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题名: From Molecular Fragments to Crystals: A UV Raman Spectroscopic Study on the Mechanism of Fe-ZSM-5 Synthesis
作者: Fan, Fengtao1, 2;  Sun, Keju1, 2;  Feng, Zhaochi1;  Xia, Haian1, 2;  Han, Bo1;  Lian, Yuxiang1;  Ying, Pinliang1;  Li, Can1
关键词: hydrothermal synthesis ;  iron ;  Raman spectroscopy ;  reaction mechanisms ;  zeolites
刊名: CHEMISTRY-A EUROPEAN JOURNAL
发表日期: 2009
DOI: 10.1002/chem.200801916
卷: 15, 期:13, 页:3268-3276
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: The entire sequence of crystallization events of Fe-ZSM-5 was monitored by UV Raman spectroscopy in combination with HRTEM, UV/Vis spectroscopy, X-ray diffraction patterns, and periodic DFT calculations. Fe-ZSM-5 was synthesized by an organic-free method to avoid signal interference from the organic template in Raman spectra. Framework iron atoms with resonance Raman bands at 516, 1115, and 1165 cm(-1). and a Raman band at 1016 cm(-1) are detected for Fe-ZSM-5. In the early stage of Fe-ZSM-5 synthesis, the precursor contains iron atoms in distorted tetrahedral coordination and five- and six-membered silicate rings. Nucleation by aggregation of the precursor species was monitored by U V Raman spectroscopy based on the resonance Raman effect, and confirmed by periodic DFT calculations. Evolution of iron species on the surface and in the bulk phase was monitored by UV Raman spectroscopy with excitation at 244 and 325 nm, as well as HRTEM. Nucleation takes place first in the core of the amorphous particles, and crystalline nuclei with Fe-ZSM-5 structure are formed in the core by consuming the amorphous shell. Finally the amorphous particles are completely transformed into Fe-ZSM-5 crystals.
关键词[WOS]: X-RAY-DIFFRACTION ;  DENSITY-FUNCTIONAL THEORY ;  ZEOLITE-A ;  HYDROTHERMAL SYNTHESIS ;  FE-SILICALITE ;  MFI ZEOLITE ;  BENZENE HYDROXYLATION ;  PHASE-TRANSFORMATION ;  MESOPOROUS MATERIALS ;  CATALYTIC-PROPERTIES
语种: 英语
WOS记录号: WOS:000264674300027
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141311
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 Sch, Dalian 116023, Peoples R China

Recommended Citation:
Fan, Fengtao,Sun, Keju,Feng, Zhaochi,et al. From Molecular Fragments to Crystals: A UV Raman Spectroscopic Study on the Mechanism of Fe-ZSM-5 Synthesis[J]. CHEMISTRY-A EUROPEAN JOURNAL,2009,15(13):3268-3276.
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