High‐Performance Titanosilicate Catalyst Obtained through Combination of Liquid‐Phase and Solid‐Phase Transformation Mechanisms

A novel strategy for the synthesis of microporous crystalline titanosilicate catalyst (TS‐1) was developed based on the combination of liquid‐phase and solid‐phase transformation mechanisms. The core concept of this strategy was to crystallize the mixed precursors composed of both liquid‐phase and solid‐phase precursors. The anionic polyelectrolyte poly(acrylic acid) was used as a unique gelating agent to prepare the solid/liquid mixture, which can partly convert the liquid‐phase precursor to the solid‐phase precursor. Active framework Ti was formed by in situ conversion of the Ti species from the solid‐phase precursor during the crystallization stage, as well as by the transfer of Ti species from the liquid‐phase precursor to the solid crystal after the crystallization. In this way, the content of active Ti in TS‐1 was significantly increased. The obtained product displayed high activity for the oxidation reaction of n ‐hexane and 1‐hexene.