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分别用H2SO4和Al2(SO4)3对中孔分子筛Al-MCM-41进行改性,得到了中孔分子筛SO42-/Al-MCM-41和Al/SO24-/Al-MCM-41。采用X射线多晶衍射(XRD)、红外光谱(FT-IR)、N2吸附-脱附和NH3程序升温脱附(NH3-TPD)等测试技术对样品的结构和表面酸性进行了表征。分别用Al-MCM-41、SO24-/Al-MCM-41和Al/SO24-/Al-MCM-41催化合成丙酸香叶酯,比较了三者的催化性能。结果表明,用Al2(SO4)3改性中孔分子筛Al-MCM-41,能得到仍保持着六方介孔结构的中孔分子筛Al/SO24-/Al-MCM-41,其酸性和催化性能比用H2SO4改性得到的SO24-/Al-MCM-41更强;用Al2(SO4)3改性不仅SO24-附着在了分子筛骨架上,而且Al也接枝在了分子筛骨架上。
The mesoporous molecular sieves Al-MCM-41 were modified with H2SO4 and Al2 (SO4) 3 respectively to obtain mesoporous molecular sieves SO42- / Al-MCM-41 and Al / SO24- / Al-MCM-41. The structure and surface acidity of the samples were characterized by XRD, FT-IR, N2 adsorption-desorption and NH3-TPD. Catalytic synthesis of geranyl propionate with Al-MCM-41, SO24- / Al-MCM-41 and Al / SO24- / Al-MCM-41 respectively. The results show that the mesoporous molecular sieve Al / SO24- / Al-MCM-41 which still retains the hexagonal mesoporous structure can be obtained by modifying Al-MCM-41 with Al2 (SO4) 3 and its acidity and catalytic performance SO24- / Al-MCM-41 modified with H2SO4 was stronger than that of SO24- / Al-MCM-41 modified with Al2 (SO4) 3, not only SO24- was attached to the molecular sieve framework, but also Al was grafted onto the molecular sieve framework.