聚烯烃催化剂载体硅胶研发进展

以Ziegler-Natta催化剂和茂金属催化剂为例,介绍了聚烯烃均相催化剂的负载化技术以及载体选择的影响因素,明确了载体的强度、密度、总孔容、孔分布、孔径、粒度和颗粒形状等物理性质是选择载体要考虑的主要因素。综述了聚烯烃催化剂载体硅胶的结构特征和性能特征,并对聚烯烃催化剂载体硅胶的合成机理、影响因素进行了详细介绍。此类载体硅胶比表面积280~320m2/g、堆密度0.28~0.32g/cm3、孔容1.40~1.70cm3/g、平均孔径18~22nm。建议通过开展对不同性能硅胶(如更小粒径、不同元素改性等)的研究开发,以满足不同催化剂对载体硅胶的特殊要求。

Recent Progress on Research and Development of Silica Gel Support for Polyolefin Catalysts

The immobolization technology and the selection of carrier of homogeneous Zeigler-Natta and metallocene catalysts were introduced.The major factors of carrier selection depend on strength,density,total pore volume,pore distribution,pore size,particle size and shape,and other physical properties of the carrier.The structure and performance characteristics of silica gel as polyolefin catalysts support were also reviewed,and the synthesis mechanism and influence factors in the process of silica gel preparation were introduced in details.The silica gel prepared have typical properties with specific surface area ranged from 280 m2/g to 320m2/g,bulk density 0.28-0.32g/cm3,porosity volume 1.40-1.70 cm3/g and average pore diameter 18-22 nm.Research on silica gel with different properties(such as smaller particle size and modified silica gel,etc.) for special requirements of catalysts was proposed.