嫁接Al改性MCM-41介孔分子筛催化合成双酚F

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

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%。

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%.