Chemical Post-Modifications of Titanosilicates

In the field of titanosilicates, increasing the content of Ti and enhancing the catalytic ability of individual Ti are two important subjects that have been extensively studied. Post-modification of titanosilicates is an effective way to improve their catalytic performance by increasing Ti content and/or enhancing the catalytic ability of individual Ti. This chapter reviews the enhancement of the activity, selectivity, and stability of titanosilicates, focusing on the factors that affect diffusion, adsorption/desorption, and surface reactions. The methods, mechanisms, and effect on catalytic performance are summarized, and the role of the solvent (solvent effect), which is crucial to the catalytic oxidation of titanosilicates, is also discussed. In general, the fine adjusting of microenvironment of Ti active sites is the core of post-modification of titanosilicates, and the coordination of Ti and solvent effect are critical to realize the formation, stabilization, and transfer of active intermediates Ti-O-O-H, which is fundamental to give full play to the catalytic performances.