新型双孔球形介孔材料用于乙烯聚合催化剂  

New double pore spherical mesoporous materials for ethylene polymerization catalysts

作　　者：吕新平[1] 周俊领[1] 亢宇[1] 王世波[1] 徐世媛[1] 张志会[1] 

机构地区：[1]中国石化北京化工研究院,北京100013

出　　处：《石油化工》2017年第9期1138-1142,共5页Petrochemical Technology

摘　　要：以喷雾干燥法制备了球形介孔材料,并以该球形介孔材料为载体制备了乙烯聚合催化剂。利用N_2吸附-脱附、XRD、SEM等方法对介孔材料进行了表征,并通过乙烯淤浆聚合考察了催化剂的聚合性能。表征结果显示,自制的球形介孔材料具有较大的比表面积,孔径呈双峰分布,存在典型的介孔结构。球形介孔材料制备的催化剂的球形度略好于参比载体制备的催化剂,粒径分布略宽。球形介孔材料制备的催化剂的催化效率和氢调性能优于相同条件下参比载体制备的催化剂,聚合过程平稳,催化活性高,制备的聚乙烯产品形态好,聚合物中粒径在75μm以下的细粉含量低。A new double pore spherical mesoporous material was made by spray-drying process, and a catalyst for ethylene polymerization was prepared by using the material as carrier. The sample was characterized by Nz adsorption-desorption, XRD and SEM. The polymerization performance was studied by slurry polymerization of ethylene. The results show that the spherical mesoporous material has large specific surface area and bimodal pore size distribution, and the sample is in sphere shape with hexagonal symmetric crystal. The catalyst has better degree of sphericity than the reference catalyst, but the particle size distribution is slightly wider. The catalytic efficiency and hydrogen performance of the catalyst is better than that of the reference catalyst with stable polymerization process and high activity. The resulting polymer has good morphology and the amount of polymer fines below 75 μm is reduced.

关 键 词：介孔 载体 催化剂 乙烯聚合 

分 类 号：TQ426.94[化学工程]