Hydrothermal Synthesis of Titanium Silicalite-1 Structurally Directed by Hexamethyleneimine

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• 作者：Haijiao Zhang ; Yueming Liu ; Zheng Jiao ; Mingyuan He ; Peng Wu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2009
• 出版时间：May 6, 2009
• 年：2009
• 卷：48
• 期：9
• 页码：4334-4339
• 全文大小：193K
• 年卷期：v.48,no.9(May 6, 2009)
• ISSN：1520-5045

文摘

Titanium silicalite-1 (TS-1) with the MFI topology has been synthesized successfully in the absence of alkali metal ions with the cooperative effects of active seeds and the structure-directing agent hexamethyleneimine (HMI). The physicochemical properties and structures of the products were characterized by various techniques. The coexistence of HMI and primary and/or secondary building units of the MFI structure in the synthesitic gels was essential for the nucleation and crystallization of TS-1. The nature and preparation conditions of the seed precursors had a great influence on the crystallization process and the incorporation of titanium atoms into the framework. It was found that a synergistic effect between HMI and the precursor seeds led to the full crystallization of TS-1. Other synthesis parameters such as boron addition, silicon source, and crystallization time were also investigated. Moreover, the present synthesis system is also applicable to the preparation of other MFI analogues.