“…When a smaller crystal size (600 nm × 400 nm × 250 nm) of TS-1 catalyst was used, the conversion of H 2 O 2 and selectivity of PO can reach to 92 and 98 mol %, respectively . According to the experimental results reported in literature, the epoxidation performance can be tuned/improved by adjusting the coordination structure of the Ti center (coordination state, solvent coordination, defect formation, and hydrolysis process), − tuning the crystal size, , modifying pore structures, solvent addition, − and so forth. Although extensive experimental − ,,, and theoretical studies ,− have been conducted on this subject, the impact factors on the formation of active intermediate species, reaction pathways, kinetics, and selectivity for alkene epoxidation with H 2 O 2 over TS-1 catalysts have not been clearly elucidated to date.…”