Effect of Template Structure and Synthesis Conditions on the Adsorption and Acid Properties of Hierarchical Titanosilicate MTW Zeolites

The type and morphology of titanosilicate hierarchical zeolites are a function of the structure of polyammonium surfactants used as structure-directing agents (SDA) and the composition of the reaction mixture. Depending on the SDA structure, nanoneedles or nanoparticles of these MTW zeolites aggregate to give nanosponges with external surface up to 200 m(2)/g and mesopore volume up to 0.4 cm(3)/g. All these titanosilicate materials have two types of Lewis moderate-strength acid sites with total concentration up to 30 mu mol/g.