Efficient construction of active TiO6 species in TS-1 zeolite via treatment with amines and ammonium salts for enhanced cyclohexene epoxidation - Kaiwei Wang; Hao Ruan; Fumin Wang; Yi Zhai; Mingshuai Sun; Yan Chen; Jiaxing Zhang; Yihao Wang; Xuyang Zou; Xubin Zhang (Fuel, 2026)