镧铝交联蒙脱土催化剂的制备及性能研究

以钠基蒙脱土为原料制备了镧铝交联蒙脱土催化剂,利用XRD、N2低温吸附、NH3-TPD、SEM和粒径分布等方法研究了镧加入量对铝改性蒙脱土结构的影响,并用于催化1,2-丙二醇和环己酮的缩合反应。实验结果表明,铝镧交联蒙脱土晶形比铝交联蒙脱土更加规整,层间距较蒙脱土明显增大,在n（Al）/n（La）=25∶1和n（Al＋La）/n（Na-mont）=2时,层间距达到了1.81 nm,镧铝交联蒙脱土比表面积达到最大为183 m^2/g,氨气的脱附温度为228℃,较铝交联蒙脱土增加了70℃;Al/La-mont催化缩酮合成,缩酮收率达到了85%。

Synthesis of A1/La-Cross-Linked Montmorillonite arid Catalytic Property

Al/La--pillared and Al--pillared montmorillonite were prepared from the raw material Na--montmorillonite, and characterized by XRD, nitrogen adsorption, NH3 --TPD, SEM and particle distribution. The ketalation was used as a probe reaction to study the catalyst activity of Al/La--pillared montmorillonite, and compared with Al--pillared montmorillonite. The results show that the crystal form of Al/La--pillared montmorillonite is more better than Al--pillared montmorillonite, the interlamellar spacing is more bigger than Na--montmorillonite. When n （Al）/n （La） is 25 ： 1 and n （Al＋La）/n （Na--mont） is 2, the interlamellar spacing of Al/La--pillared montmorillonite is 1.81 nm, the surface area of BET is 183 m^2/g, and the temperature of NH3- desorption（228℃） than Al--pillared montmorillonite is 70℃. The yield of cyclohexanone ethylene ketal can reaeh 85% in the presence of Al/La --pillared montmorillonite.