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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
KeywordHydrothermal Synthesis Iron Raman Spectroscopy Reaction Mechanisms Zeolites
Source PublicationCHEMISTRY-A EUROPEAN JOURNAL
2009
DOI10.1002/chem.200801916
Volume15Issue:13Pages:3268-3276
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Multidisciplinary
WOS Research AreaChemistry
WOS KeywordX-RAY-DIFFRACTION ; DENSITY-FUNCTIONAL THEORY ; ZEOLITE-A ; HYDROTHERMAL SYNTHESIS ; FE-SILICALITE ; MFI ZEOLITE ; BENZENE HYDROXYLATION ; PHASE-TRANSFORMATION ; MESOPOROUS MATERIALS ; CATALYTIC-PROPERTIES
AbstractThe 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.
Language英语
WOS IDWOS:000264674300027
Citation statistics
Cited Times:50[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/141311
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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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