Amino acid-assisted synthesis of TS-1 zeolites containing highly catalytically active TiO6 species

Tailoring the Ti coordination states in titanosilicate zeolites to simultaneously improve feedstock conversion and maximize target product selectivity remains a challenge pursuit of high-performance catalysts for selective oxidation reactions. Herein, we provide facile strategy synthesize hierarchical anatase-free TS-1 (MFI-type) with tetrahedrally coordinated (TiO4) octahedrally species (TiO6). The TiO4 high epoxide selectivity, while TiO6 afford improved alkene conversion. This is achieved by synergistically using an L-lysine-assisted approach two-step crystallization; crystallization prevents formation anatase TiO2, L-lysine stabilizes ensures efficient incorporation into zeolites. Compared their conventional counterparts, which only contain species, as-prepared (Si/Ti = 36.9) result higher 1-hexene (33%), TON value (153), comparable (95%). synthetic provides avenues tailor amount distribution achieve catalytic performances various processes.