Finding the “Missing Components” during the Synthesis of TS-1 Zeolite by UV Resonance Raman Spectroscopy
Finding the “Missing Components” during the Synthesis of TS-1 Zeolite by UV Resonance Raman Spectroscopy
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DOI：
10.1021/jp310900a
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发表时间：
2013-02
影响因子：
3.7
通讯作者：
Q. Guo;Zhaochi Feng;Guanna Li;Fengtao Fan;Can Li
中科院分区：
文献类型：
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作者：
Q. Guo;Zhaochi Feng;Guanna Li;Fengtao Fan;Can Li
TS-1分子筛的催化性能很大程度上取决于钛物种的种类及其在分子筛中的浓度。结合紫外/维斯光谱，我们采用紫外共振拉曼光谱研究了TS-1分子筛晶化过程中钛物种的演化。据发现，一小部分的Ti物种从固相浸出到液相中。由于在266 nm处激发的共振拉曼效应，在TS-1的组装过程中除了骨架Ti物种之外的“缺失”Ti物种被鉴定为孤立的“TiO 6”物种。阐明了TS-1中骨架Ti物种的形成机理及其与合成过程中孤立的“TiO 6”物种的关系。设计了一种合成策略，以增加骨架钛的浓度为1.5倍的TS-1沸石的实际合成。
The catalytic performance of TS-1 zeolite greatly depends on the types of titanium species and their concentrations in the zeolite. Coupled with UV/vis spectroscopy, we present a UV resonance Raman spectroscopic investigation on the evolution of the titanium species during the crystallization of TS-1 zeolite. It is found that a small portion of Ti species leaches from the solid phase into the liquid phase. The “missing” Ti species in addition to the framework Ti species during the assembly process of TS-1 is identified as isolated “TiO6” species, due to the resonance Raman effect excited at 266 nm. The formation mechanisms of framework Ti species in TS-1 and the relation with the isolated “TiO6” species during the synthesis process are clarified. A synthetic strategy was designed to increase the concentration of the framework titanium by a factor of 1.5 for the actual synthesis of TS-1 zeolite.