Finding the 鈥淢issing Components鈥?during the Synthesis of TS-1 Zeolite by UV Resonance Raman Spectroscopy

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• 作者：Qiang Guo ; Zhaochi Feng ; Guanna Li ; Fengtao Fan ; Can Li
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：February 14, 2013
• 年：2013
• 卷：117
• 期：6
• 页码：2844-2848
• 全文大小：259K
• 年卷期：v.117,no.6(February 14, 2013)
• ISSN：1932-7455

文摘

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 鈥渕issing鈥?Ti species in addition to the framework Ti species during the assembly process of TS-1 is identified as isolated 鈥淭iO₆鈥?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 鈥淭iO₆鈥?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.