Development of a new zeolite catalyst with multi-dimensional pore system toward environmentally benign oxidation catalyst

采用干凝胶转化（DGC）的一种蒸汽辅助结晶（SAC）方法合成了有机结构导向剂（OSDA）和纯二氧化硅MSE前驱体的高结晶复合材料YNU-2P。由于YNU-2P中存在大量的位点缺陷，导致MSE骨架在煅烧过程中坍塌，这些缺陷部分被蒸硅填充，从而使MSE骨架稳定为微孔纯硅材料YNU-2。其余的站点缺陷允许原子插入到框架中。通过对TiCl4蒸、气相处理条件的优化，实现了Ti在骨架中的有效引入，得到了新型微孔钛硅酸盐Ti- ynu -2。该材料被证明是一种高性能催化剂，与Ti-MCM-68相比，在H2O2作为氧化剂的苯酚氧化过程中，其性能显著提高，而Ti-MCM-68的性能已经优于TS-1。

YNU-2P, a highly crystalline composite of organic structure-directing agent (OSDA) and pure-silica MSE precursor, was synthesized by steam-assisted crystallization (SAC), a form of dry-gel conversion (DGC). The presence of a significant quantity of site defects in the YNU-2P caused the collapse of the MSE framework during calcination, and the defects were partially filled with Si by steaming, thus stabilizing the MSE framework as the microporous pure-silica material YNU-2. The remaining site defects allow atom insertion into the framework. After optimizing the conditions for steaming and vapor phase TiCl4 treatments, the efficient introduction of Ti into the framework was accomplished to give the new microporous titanosilicate Ti-YNU-2. This material proved to be a high-performance catalyst, exhibiting remarkably enhanced performance compared to Ti-MCM-68, a material already known to show superior performance to TS-1, during phenol oxidation using H2O2 as an oxidant.