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From Molecular Fragments to Crystals: A UV Raman Spectroscopic Study on the Mechanism of Fe-ZSM-5 Synthesis
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
2009
DOI10.1002/chem.200801916
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
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
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.
语种英语
WOS记录号WOS:000264674300027
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文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/141311
专题中国科学院大连化学物理研究所
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
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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.
APA Fan, Fengtao.,Sun, Keju.,Feng, Zhaochi.,Xia, Haian.,Han, Bo.,...&Li, Can.(2009).From Molecular Fragments to Crystals: A UV Raman Spectroscopic Study on the Mechanism of Fe-ZSM-5 Synthesis.CHEMISTRY-A EUROPEAN JOURNAL,15(13),3268-3276.
MLA Fan, Fengtao,et al."From Molecular Fragments to Crystals: A UV Raman Spectroscopic Study on the Mechanism of Fe-ZSM-5 Synthesis".CHEMISTRY-A EUROPEAN JOURNAL 15.13(2009):3268-3276.
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