微米级类球形介孔材料用于乙烯聚合催化剂OA北大核心CSTPCD

Hydrophobic spherical mesoporous materials were prepared by hydrophobic treatment with 2-(4-chlorosulfonylphenyl)ethyltrimethoxysilane,and used as a support to prepare polyethylene catalysts by airflow spray drying.The spherical mesoporous materials before and after hydrophobic treatment were characterized by XRD,N2 adsorption-desorption,TEM and SEM.The effects of carrier gas flow and slurry concentration on polyethylene catalyst during airflow spray drying were investigated,and the ethylene polymerization activity of the catalyst was evaluated.The experimental results show that the pore structure and microstructure of the spherical mesoporous materials are stable after hydrophobic treatment.The best spray drying conditions are as follows:the inlet and outlet temperature of the spray dryer is 140,105℃,the carrier gas flow is 30 L/s,and the slurry concentration is 30%(w).When the catalyst prepared under the optimal spray drying conditions is used for ethylene polymerization,its catalytic activity is 28 000 g/g,which is much higher than that of the catalyst prepared by TS-610 silica gel for industrial use(9 000 g/g).The performance of the polymer powder obtained by the reaction is better than that of the polyethylene powder prepared with the catalyst prepared by TS-610 silica gel.