嫁接Al改性MCM-41介孔分子筛催化合成双酚F

以十六烷基三甲基溴化铵和正硅酸乙酯为原料，合成纯硅MCM-41介孔分子筛。 再利用九水硝酸铝为改性剂来嫁接改性纯硅MCM-41介孔分子筛，NH3-TPD结果表明，嫁接后的AlMCM-41产生了中强酸。 用改性后不同n(Si)/n(Al)的AlMCM-41催化合成双酚F，在n（苯酚）/n（甲醛）=30、反应时间5 h、反应温度90 ℃、m（甲醛）/m（AlMCM-41）=7的反应条件下，在一定范围内，双酚F的产率随Al含量增加而增加，但在n（Si）/n（Al）＜50时，双酚F的产率反而下降，当n（Si）/n（Al）=50时，双酚F的产率最高，为42.28%。

Synthesis of Bisphenol F Catalyzed by Aluminum-grafted MCM-41 Mesoporous Molecular Sieve

Cetyltrimethylammonium bromide(CTAB) and tetraethylorthosilicate(TEOS) were selected as raw materials for the synthesis of pure silicon MCM-41. Using Al(NO3)3·9H2O as aluminum source to modify pure silicon MCM-41 by grafting method. The AlMCM-41 was characterized by NH3-TPD. The results show that AlMCM-41 produced mild acid after grafting. The synthesis of bisphenol F was catalyzed by AlMCM-41 with different silicon/aluminium. The optimized reaction conditions are:n(phenol)/n(formaldehyde)=30, reaction time of 5 h, reaction temperature of 90 ℃, m(formaldehyde)/m(AlMCM-41)=7. In a certain range, the yield of bisphenol F increases with the increase of Al. When the n(Si)/n(Al) is less than 50, the yield of bisphenol F tends to decrease. While n(Si)/n(Al)=50, the yield of bisphenol F can reach its highest value of 42.28%.