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用几种稀土元素对单一型固体超强酸SO24-/TiO2进行改性。结果表明,用Ce4+改性效果较好,且当Ce4+质量分数为7.5%、经500℃焙烧3h后催化剂SO24-/TiO2-Ce4+的催化活性最佳,并用TEM、XRD和IR对其结构进行了表征。该改性催化剂属于纳米级材料,粒径为32nm,粒度均匀。并以该固体超强酸SO24-/TiO2-Ce4+为催化剂,松油醇和乙酸酐为原料合成乙酸松油酯。利用正交试验得到适宜的合成条件为:反应温度70℃、催化剂用量3%、松油醇与乙酸酐物质的量之比为1∶1.5、反应时间6h。在此条件下,松油醇转化率达99%,产物中乙酸松油酯含量达90%。与普通型固体超强酸进行比较,SO24-/TiO2-Ce4+具有更高的催化活性和选择性。
Several rare earth elements were used to modify single solid superacid SO24- / TiO2. The results show that the modification with Ce4 + is better, and the catalytic activity of SO24- / TiO2-Ce4 + is best when the mass fraction of Ce4 + is 7.5% and calcined at 500 ℃ for 3h. The structure of the catalyst is characterized by TEM, XRD and IR Characterization. The modified catalyst belongs to nano-scale material with particle size of 32nm and uniform particle size. And the solid superacid SO24- / TiO2-Ce4 + catalyst, terpineol and acetic anhydride as raw materials synthesis of pine acetate. The optimum synthesis conditions were as follows: the reaction temperature was 70 ℃, the amount of catalyst was 3%, the ratio of terpineol to acetic anhydride was 1: 1.5, and the reaction time was 6h. Under these conditions, the conversion of terpineol reached 99% and the content of terpinyl acetate in the product reached 90%. Compared with common solid superacids, SO24- / TiO2-Ce4 + has higher catalytic activity and selectivity.