In this work, titanosilicate MFI (TS-1) crystals with different Si/Ti ratio were treated with tetrapropylamonium hydroxide (TPAOH) solution of different concentrations. The results showed that the properties – crystal structure, titanium position, secondary pore structure and volume – of the treated samples strongly depend on the Si/Ti ratio of the parent TS-1 sample and the TPAOH concentration. For instance, high TPAOH concentration is necessary to induce titanium re-insertion into framework position and to create inter-connected open meso/macropore in TS-1 with low Si/Ti ratio. On the contrary, TPAOH treatment even at high concentration was found to be ineffective in the post-synthesis treatment of low titanium containing TS-1 samples and result in a phase change from orthorhombic to monoclinic. The post-treated high titanium containing and inter-connected secondary pore TS-1 samples exhibited higher activity for cyclohexene epoxidation than the parent TS-1 sample with similar Si/Ti. This technique provides a controlled way of mesopore creation in TS-1 materials, which may be extended to other titanium base microporous materials.

在这项工作中，用不同浓度的氢氧化四丙铵（TPAOH）溶液处理了具有不同Si / Ti比的钛硅酸盐MFI（TS-1）晶体。结果表明，所处理样品的性能-晶体结构，钛位置，二级孔结构和体积-很大程度上取决于母体TS-1样品的Si / Ti比和TPAOH浓度。例如，高TPAOH浓度对于诱导钛重新插入框架位置并在低Si / Ti比的TS-1中产生相互连接的开放介孔/大孔是必要的。相反，发现即使在高浓度下，TPAOH处理在含钛量低的TS-1样品的合成后处理中也是无效的，并且导致从斜方晶到单斜晶的相变。经过后处理的高钛含量和相互连接的次级孔TS-1样品比具有相似Si / Ti的母体TS-1样品具有更高的环己烯环氧化活性。该技术提供了在TS-1材料中产生中孔的受控方式，该方法可扩展到其他钛基微孔材料。