新工艺制备固体超强酸SO_4^(2-)/SnO_2-Nb_2O_5及其催化松油醇酯化

Preparation of solid superacid SO_4^(2-)/SnO_2-Nb_2O_5 by a new technology and applied it to catalyze the esterification of terpineol

采用新工艺制备固体超强酸SO42-/SnO2-Nb2O5,将其应用于松油酯化反应。催化剂最佳制备条件:Nb2O5引入(SnO2质量分数)3%,浸渍硫酸浓度1.5 mol/L,500℃焙烧3.0 h;最佳反应条件:n(松油醇):n(乙酸酐)=1.0:1.2,催化剂用量(松油醇质量分数)5%,50℃反应3.0 h;并采用FT-IR、XRD、TG-DTA对催化剂进行表征。结果表明:催化剂可使得松油醇转化率达94.3%,乙酸松油酯选择性达86.2%,新工艺制备的催化剂较沉淀法和sol-gel法的活性高。

Use a new technology to prepare Soild superacid of SO4^2-/SnO2-Nb2 O5. Applied it to catalyze the esterification of terpine- oL The optimum preparation conditions for the catalyst are：content of Nb2O5 3% （mass fraction in SuO2 ）, impregnated with 1.5 moL./L, calcinated at 500℃ for 3 h. The optimum reaction conditions for the estarification of terpineol are：n （terpineol） ：n （acetic anhydride）= 1. 0：1. 2,catalyst quantity 5% （mass fraction in terpineol） ,react at 50 ℃ for 3 h. These catalysts were characterized by XRD,FT-IR and TG-DTA. The results show that：the conversion of terpincol reached 94. 3%and the Selectivity of Terpinyl acetate reached 86. 2% in the reaction, the new method is much better than precipitation and sol-gel in preparation of catalyst.