Abstract:

Both self-made silica and reference silica were modified by the sol-gel method and the traditional impregnation，method，and were used as carrier to prepare the chromium-based catalysts. The two silicas were investigated by using TG-DTA，BET and SEM，and the supported catalysts were used in polymerization experiments. The results showed that the reference silica had sufficiently more preliminary dry ness and better breaking strength than the self-made silica，but worse surface configuration. The activity of catalyst was enhanced by adding Ti. When the Ti modifier was added in the same amount，the catalyst which prepared with silica that had been modified by the sol-gel method had better catalytic activity compared to that catalyst which prepared with silica that had been modified by the traditional impregnation method.

摘要：

对自制硅胶和参考硅胶进行了两种方法的改性并分别制得铬系催化剂，利用热重分析仪（TG-DTA）、比表面积测定仪（BET）和扫描电子显微镜（SEM）对两种硅胶进行了分析，并对所制备的催化剂进行了聚合实验。结果表明，自制硅胶初始干燥不如参考硅胶充分。自制硅胶表观形态较优，但其破碎强度不如参考硅胶。改性剂钛的引入有利于催化活性的提高，钛的加入量一样时，通过溶胶-凝胶法改性后载体制备的催化剂活性高于传统浸渍法改性后载体制备的催化剂活性。