Novel method for synthesis of titanium silicalite-1 (TS-1)

Titanium silicalite‐1 (TS‐1) was easily synthesized using inorganic silicon and titanium source, tetrapropylammonium bromide (TPABr) or TPAOH as templating molecule, NH₃H₂O, HDA or TEAOH etc. as base sources. In this system, TPA⁺ cations (come from TPABr or TPAOH) served as templating agents to direct the MFI structure. NH₃H₂O, TEAOH or HDA etc. provides the alkalinity necessary for crystallization. X‐ray diffraction, UV‐Vis, IR spectroscopies, SEM, ²⁹Si MAS NMR showed that the zeolites obtained possessed all the structural characteristics of TS‐1, and titanium atoms were introduced into the framework in TS‐1. This material was proved to have high crystallinity and high catalytic activity to allyl chloride epoxidation and propylene epoxidation. All the samples synthesized had similar catalytic properties with a standard TS‐1 through compared inorganic reactant system with organic synthesis system using propylene epoxidation. The effects of silicon source and TPABr/SiO₂ ratio were discussed.