磁性纳米固体酸催化剂Zr(SO_4)_2/Fe_3O_4的制备及催化性能研究

Preparation and Character Study of the Magnetic Nano-Size Solid Acid Catalyst

本文提出将磁性和固体酸进行组装从而合成磁性纳米固体酸催化剂的思路，首先制备了纳米级磁性前体一磁基体（Ｆｅ３Ｏ４）；然后筛选出超声波法制备了不同配比的磁性纳米固体酸催化剂Ｚｒ（ＳＯ４）２／Ｆｅ３Ｏ４，对其进行了初步表征。并将其作为乙酸丁酯合成反应的催化剂，酯化转化率最高达到８４％，利用其磁性即可将催化剂进行分离。

Colloidal Fe3O4 was prepared and the strength of magnetism of which was obviously influenced by the ratio of Fe3+ and Fe2+ and the concentration of NaOH solution. A series of the magnetic nano solid acid catalysts were better prepared by the ultrasonic waves, and the characters of these catalysts were preliminarily tested. When they were all used in the esterification reaction(acetic acid and butyric mellow), the best conversation was 84%. These catalysts which were: all nano-size could he isolated from other matters according to their magnetism. Moreover, their magnetism, conversation and recycle percentage were affected by different ratios of Zr(SO4)(2) and Fe3O4. By other determinative methods like XRD and specific surface area, the structure of the Lest catalyst in the presently experimental condition was supposed.