S2O82-/ZrO2-TiO2 固体超强酸催化剂的制备及其酯化性能

利用共沉淀和低温陈化法制备S₂O₈^2-/ZrO₂-TiO₂ 固体超强酸作为合成硬脂酸正丁酯的催化剂。通过XRD、FT-IR和SEM对催化剂进行表征, 考察n(Zr)∶n(Ti)、焙烧温度、浸渍液浓度和浸渍时间对催化剂催化活性的影响，以酯化合成硬脂酸正丁酯实验为探针，同时考察反应温度和n(硬脂酸)∶n(正丁醇)对酯化率的影响。结果表明，在n(Zr)∶n(Ti)=2∶2、浸渍液(NH₄)₂ S₂O₈浓度0.5 mol·L^-1、浸渍时间6 h、焙烧温度500 ℃、n(硬脂酸)∶n(正丁醇)=1∶3、催化剂用量0.2 g、反应温度120 ℃和反应时间3 h条件下，酯化率可达98.69%。

Preparation of S2O^2-8/ZrO2-TiO2 solid superacid catalyst and its catalytic activity for esterification

Abstract： Solid superacid catalyst S2O^2-8/ZrO2-TiO2 was prepared by co-precipitation and low temperature aging method, and characterized by XRD, FT-IR and SEM. The effects of molar ratio of Zr to Ti in the catalyst, calcination temperature, the concentration of impregnating solution （ NH4 ） 2S2Os, and impregnating time, mole ratio of stearic acid to butanol and reaction temperature on catalytic activity of the catalyst were investigated using S20~-/ZrO2-TiO2 solid superacid as the catalyst and the synthesis of butyl stearate as the probe reaction. The results showed that the esterification rate of 98.69% was attained under the optimum condition as follows ： n （Zr） ： n （ Ti ） = 2： 2, the concentration of impregnating solution （ NH4 ） 2 S208 0.5 mol · L - 1, impregnating time 6 h, calcination temperature 500 ℃, n （ stearic acid ） ： n（butanol） = 1：3, catalyst dosage 0.2 g, reaction temperature 120 ℃and reaction time 3 h.