Abstract In this study, we have developed a new method to synthesize mesoporous titanium silicalite-1 (TS-1) with a higher content of active titanium in the framework (more than 5%) than that obtained from the conventional hydrothermal synthesis. The new method combines two methods as follows: (1) a sol-gel method in tetrahydrofuran for the synthesis of TiO2–SiO2 composite with highly dispersed Ti species and (2) a dry gel conversion method for the crystallization to TS-1. This investigation revealed that the dispersion of Ti in the starting materials was quite important to synthesize mesoporous TS-1 with high content of Ti besides dry conversion method. The obtained mesoporous TS-1 with a high content of titanium showed higher catalytic activity in 1-hexene epoxidation than conventional TS-1. This high activity is likely to originate from the high content of titanium in the framework.

中文翻译：

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使用具有高度分散的 Ti 物种的无定形 TiO2-SiO2 复合材料通过干凝胶转化法合成高 Ti 钛硅沸石-1 (TS-1) 沸石

摘要 在本研究中，我们开发了一种合成介孔钛硅沸石-1 (TS-1) 的新方法，其骨架中的活性钛含量高于传统水热合成法的含量（超过 5%）。新方法结合了以下两种方法：(1) 在四氢呋喃中的溶胶-凝胶法合成具有高度分散的 Ti 物种的 TiO2-SiO2 复合材料；(2) 干凝胶转化法结晶为 TS-1。该研究表明，除了干法转化法外，Ti 在起始材料中的分散对于合成高 Ti 含量的介孔 TS-1 非常重要。获得的高钛含量介孔TS-1在1-己烯环氧化中表现出比传统TS-1更高的催化活性。