摘要
用水热晶化法合成了Ti-MCM-41分子筛,并对其进行甲基硅烷化改性。用X射线衍射、傅里叶变换红外光谱和紫外漫反射光谱等手段对其结构进行了表征,在过氧化氢异丙苯做氧化剂催化环氧化丙烯制环氧丙烷的反应中,考察了催化剂的环氧化性能。结果表明:甲基硅烷化增强了Ti-MCM-41分子筛的表面疏水性,但分子筛的介孔特征仍然保持,改性后催化剂的活性提高,环氧丙烷的选择性可达92.1%。反应产物中的α,α-二甲基苄醇用于过氧化二异丙苯合成,可得过氧化二异丙苯产率71.2%。
Ti-MCM-41 mesoporous molecular sieves were synthesized by hydrothermal method and silylated with trimethylchlorosilane （TMCS）. The sieves were characterized by means of X-Ray diffraction （XRD）, Fourier transform infrared spectrometer （FTIR） and UV-Vis diffuse reflectance spectroscopy. The epoxidation function of Ti-MCM-41 samples were investigated in the process from epoxidation of propylene to propylene oxide with cumene hydroperoxide（CHP） as oxidant. The results showed that the silylation could enhance surface hydrophobicity of the sieves, however, existence of the mesoporous characteristics. Because of the modification the activity of the catalysts was increased, the selectivity for propylene oxide up to 92.1%. The α,α-dimethyl benzyl alcohol in the reaction product for synthesis of dicumyl peroxide, its yield was up to 71.2%.
出处
《石化技术》
CAS
2011年第3期7-11,共5页
Petrochemical Industry Technology
关键词
分子筛
硅烷化
丙烯环氧化
过氧化二异丙苯
molecular sieves
silylation
propene epoxidation
dicumyl peroxide
