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

点击翻译按钮获取中文摘要

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.