Preparation of Single-Site Catalyst Inside the Functionalized Nanopore of Silica and Its Ethylene Polymerization

摘要

Amorphous silica have been functionalized with organo-silane, and (n-BuCp)_2ZrCl_2 and methylaluminoxane (MAO) were subsequently immobilized on the functionalized silica for the further evaluation as a catalyst of ethylene polymerization. Four organo-silanes such as 3-aminopropyltrimethoxysilane (1NS), N-[(3-trimethoxysilyl)propyl]ethylenediamine (2NS), N~1-[3-(trimethoxysilyl)propyl]diethylenetriamine (3NS), and 4-(triethoxysilyl)butyronitrile (1NCy), were employed for this study. The Zr content and polymerization activity of the supported catalysts were strongly dependent on the kind and structure of organo-silane. 2NS showed the highest Zr content with higher activity, indicating the more Zr could be captured due to a stronger interaction between (n-BuCp)_2ZrCl_2 and amine group.