Abstract:

The physical and structural properties of BCH and NT-1 industrial catalysts were characterized with XRD and BET. The effect of their structure on catalytic activity for ethylene slurry polymerization was investigated. It was found that BCH had a higher initial activity due to more macro-pores，which was in favor of the diffusion of ethylene. During the intermediate and final stage，the activity of BCH was lower than NT-1 because part of active sites were embedded by polymer. The product synthesized by NT-1 catalyst possessed bigger average particle size，narrower particle size distribution and better mechanical properties than that synthesized by BCH catalyst. However，the bulk density of polyethylene produced by NT-1 catalyst was slightly lower than that produced by BCH catalyst. NT-1 catalyst’s sensitivity of hydrogen response and ability of copolymerization were better than those of BCH catalyst.

摘要：

利用XRD和BET测试技术对BCH和NT-1两种工业催化剂进行了物相表征和结构分析，研究了两种催化剂的结构对其催化乙烯淤浆聚合活性的影响。结果表明，BCH催化剂较多的大孔有利于单体的扩散，使得其初始活性较高，随着部分活性中心的被包埋导致中后期活性低于NT-1催化剂。采用NT-1催化剂聚合得到的产品粉末平均粒径大，粒径分布集中，但堆密度略低；产品的力学性能略优于用BCH聚合得到的产品。NT-1催化剂的氢调敏感性和共聚性能优于BCH催化剂。