化工学报2018，Vol.69Issue(2)：664-673,封2,11.DOI:10.11949/j.issn.0438-1157.20171035
铬钒双金属催化剂乙烯聚合反应动力学模型化
Kinetic modeling of ethylene polymerization with Cr-V bimetallic catalyst
摘要
Abstract
Bimetallic catalyst has been a hot research topic as it can realize one-pot synthesis of polyethylene with bimodal molecular weight distribution (MWD). The kinetics of ethylene homopolymerization with a novel Cr-iV bimetallic catalyst and corresponding monometallic S-2 and iV catalyst were studied at various experimental conditions. MWD deconvolution of polymers made by these catalysts showed interaction between Cr and V active centers in the Cr-iV bimetallic catalyst, reduced the activity of Cr centers, while activity of V centers was improved. Polymerization temperature almost did not change mass fractions of polymers produced by two active centers. The simplified single-center kinetic model for ethylene homopolymerization was employed to describe polymerization behaviors of Cr and V centers in Cr-iV bimetallic catalyst. Kinetic parameters of each active center were estimated by fitting experimental results of polymerization rates with model prediction. Compared to monometallic catalyst, Cr center in the Cr-iV catalyst had decreased chain propagation rate constant, which lead to reduction of polymerization activity, whereas V center in the Cr-iV catalyst had decreased chain deactivation rate constant, which signified more stable and active V center.关键词
双金属催化剂/乙烯聚合/动力学/模型化Key words
bimetallic catalyst/ethylene polymerization/kinetics/modeling分类
化学化工引用本文复制引用
刘宝,田洲,赵柠,刘柏平..铬钒双金属催化剂乙烯聚合反应动力学模型化[J].化工学报,2018,69(2):664-673,封2,11.基金项目
国家自然科学基金项目(21404061,21674036) （21404061,21674036）
中央高校基本科研业务费项目(222201714054).supported by the National Natural Science Foundation of China(21404061,21674036)and the Fundamental Research Funds for the Central Universities(222201714054). （222201714054）
