DICP OpenIR
学科主题物理化学
Identifying the pieces of puzzles in the very early stages of zeolite formation process:an UV Raman spectroscopic study
Fan FT(范峰滔); Li C(李灿)
会议文集Studium Conference
会议名称In‐situ Molecular Spectroscopic Technique and Application
会议日期2011-6-20
2011
会议地点Orleans
页码19-0
出版者待补充
出版地待补充
合作性质特邀报告
部门归属503
主办者法国国家科学研究院
英文摘要The synthesis mechanism of zeolite has drawn much attention due to their use in oil refining, petrochemical and fine chemical industry field. Understanding the synthesis mechanism of zeolite is a very interesting but challenging topic, because zeolite crystals are usually formed through complicated routes. UV Raman spectroscopy is a powerful technique to characterize zeolite synthesis process because it can avoid the fluorescence interference occurring in visible Raman spectra and concurrently enhances the Raman signal owing to the short wavelength and resonance Raman effect. In this lecture, the synthesis processes of zeolite and transition metal-containing zeolite (such as zeolite X, AlPO-5, Fe-ZSM-5 and Fe-ZSM-35) have been studied with in situ Raman and Resonance Raman techniques coupled to the home-assembled UV Raman spectrograph. The synthesis mechanism of these zeolites, including the identification of primary units, assembly through key intermediates, transition metal species and organic templates in the very early stages of zeolite formation have been all well studied. The synthesis process of zeolite X and AlPO-5 have been studied by In situ UV Raman spectroscopy. It is found that zeolite X are formed via the assembly of 4-rings, branched units in the solid phase and monomer silicate species in the liquid phase. In the synthesis process of AlPO-5, the condensation of the 4-ring species with the steric role of the organic templates results in an amorphous pre-state with channel-like structures, which subsequently transform into 3D AFI architectures via the newlybuilt 6-rings. The evolutions of the zeolite framework and iron species were studied by UV Raman and UV resonance Raman spectroscopies during the synthesis of Fe-ZSM-5. The precursor contains iron atoms in distorted tetrahedral coordination and silicate rings in the early synthesis stage. Nucleation via aggregation of these precursor species happened from inside out of the amorphous particles has been observed. Based on the understanding of the synthesis mechanism of zeolites, the synthesis strategies of iron containing zeolite have been developed, which include assembly of tailored iron species and zeolite intermediates.; The synthesis mechanism of zeolite has drawn much attention due to their use in oil refining, petrochemical and fine chemical industry field. Understanding the synthesis mechanism of zeolite is a very interesting but challenging topic, because zeolite crystals are usually formed through complicated routes. UV Raman spectroscopy is a powerful technique to characterize zeolite synthesis process because it can avoid the fluorescence interference occurring in visible Raman spectra and concurrently enhances the Raman signal owing to the short wavelength and resonance Raman effect. In this lecture, the synthesis processes of zeolite and transition metal-containing zeolite (such as zeolite X, AlPO-5, Fe-ZSM-5 and Fe-ZSM-35) have been studied with in situ Raman and Resonance Raman techniques coupled to the home-assembled UV Raman spectrograph. The synthesis mechanism of these zeolites, including the identification of primary units, assembly through key intermediates, transition metal species and organic templates in the very early stages of zeolite formation have been all well studied. The synthesis process of zeolite X and AlPO-5 have been studied by In situ UV Raman spectroscopy. It is found that zeolite X are formed via the assembly of 4-rings, branched units in the solid phase and monomer silicate species in the liquid phase. In the synthesis process of AlPO-5, the condensation of the 4-ring species with the steric role of the organic templates results in an amorphous pre-state with channel-like structures, which subsequently transform into 3D AFI architectures via the newlybuilt 6-rings. The evolutions of the zeolite framework and iron species were studied by UV Raman and UV resonance Raman spectroscopies during the synthesis of Fe-ZSM-5. The precursor contains iron atoms in distorted tetrahedral coordination and silicate rings in the early synthesis stage. Nucleation via aggregation of these precursor species happened from inside out of the amorphous particles has been observed. Based on the understanding of the synthesis mechanism of zeolites, the synthesis strategies of iron containing zeolite have been developed, which include assembly of tailored iron species and zeolite intermediates.
文献类型会议论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/116090
专题中国科学院大连化学物理研究所
通讯作者Li C(李灿)
推荐引用方式
GB/T 7714
Fan FT,Li C. Identifying the pieces of puzzles in the very early stages of zeolite formation process:an UV Raman spectroscopic study[C]. 待补充:待补充,2011:19-0.
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