Al/SO42-复合改性CrOx/VOx/SiO2双金属催化剂及其乙烯聚合特性研究
Al/SO42-modification for CrOx/VOx/SiO2 bimetallic catalysts for ethylene polymerization
郭建豪 1高玉李 2刘柏平 1义建军 2金玉龙1
作者信息
- 1. 华南农业大学,广东 广州 510642
- 2. 中国石油天然气股份有限公司石油化工研究院,北京 102206
- 折叠
摘要
采用溶液浸渍及高温煅烧的方法制备了一系列Al/SO42-复合改性CrOx/VOx/SiO2双金属催化剂,并研究了其催化乙烯聚合特性.结果表明:采用较低的m(Al)∶m(S)改性的双金属催化剂活性较未改性催化剂提升20%～40%;改性前后催化剂均表现出稳定的聚合活性,采用改性催化剂制备的聚合物相对分子质量更高,相对分子质量分布更宽;采用改性前后催化剂制备的聚合物相对分子质量分布均呈双峰,采用改性催化剂时其超高相对分子质量部分含量有所增加,而中、高相对分子质量部分含量明显更少.上述结果为单釜高效合成双峰聚乙烯产品及聚合物相对分子质量调控提供了重要手段.
Abstract
A series of bimetallic CrOx/VOx/SiO2 catalysts modified by Al/SO42-were prepared via solution impregnation and high temperature calcination,whose activity for ethylene polymerization were observed.The results show that the activity of modified catalysts with relatively lower mass fraction of Al to S is improved by 20%-40% than that of the unmodified catalysts.The activities are stable for both the modified and unmodified catalysts.The molecular weight(Mw)of the products get higher generally,and whose molecular weight distribution is wider after Al/SO42-modification.Bimodal polyethylene(PE)is synthesized by both modified and unmodified catalysts.The relative content of ultrahigh Mw PE fractions is increased,and the contents of middle-to-high Mw PE fractions decrease obviously for the PE produced by the modified catalyst,which offer an important method for one-pot synthesis of bimodal PE with high efficiency,as well as the regulation of Mw of PE products.
关键词
双金属催化剂/乙烯聚合/双峰/氧化铝/硫酸根Key words
bimetallic catalyst/ethylene polymerization/bimodal/alumina/sulfate引用本文复制引用
出版年
2024
NETL
NSTL
万方数据