关键词: 静电“S⁺X^-I⁺”组装途径, Ti-MCM-41分子筛, 合成, 催化氧化

Abstract: Ti-containing mesoporous molecular sieves Ti-MCM-41 were synthesized by electrostatic S⁺X^-I⁺ assembly pathway.Influences of different factors on the structure of Ti-MCM-41, as well as catalytic oxidation performance of Ti-MCM-41 on many kinds of alkenes were investigated systematically.Only a part of Ti source could be introduced into the framework of Ti-MCM-41 molecular sieve due to the high solubility of Ti under strongly acidic conditions.Ti content in framework decreased with the increase of HCl/TEOS, while the yield, the unit cell parameter a₀ and the framework wall thickness δ_w of Ti-MCM-41 molecular sieve increased with the increase of HCl/TEOS.The highly ordered of Ti-MCM-41 molecular sieve could be obtained in the wide range of C16TMABr /TEOS（0.3～1.0）and H₂O/TEOS（60～120）.The template could be effectively recovered from the Ti-MCM-41 precursor by extraction with a mixed solvent of acetone-water which would not change the ordered structure of Ti-MCM-41 products. Ti-MCM-41 showed catalytic activity to oxidation of many alkenes with hydrogen peroxide or molecular oxygen as oxidizer. The catalytic activity of Ti-MCM-41 from electrostatic S⁺X^-I⁺ assembly pathway was a little lower than that of Ti-MCM-41 from hydrothermal crystallization.

Key words: 静电“S⁺X^-I⁺”组装途径, Ti-MCM-41分子筛, 合成, 催化氧化