文献类型：期刊文献

英文题名：A novel SiO₂-supported inorganic and organic hybrid chromium-based catalyst for ethylene polymerization

作者：Zhang, Shiliang[1];Dong, Qi[1];Cheng, Ruihua[1];He, Xuelian[1];Wang, Quntao[2];Tang, Yan[2];Yu, Yongling[2];Xie, Kan[2];Da, Jianwen[2];Liu, Boping[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]SINOPEC, Res Inst Qilu Branch Co, Zibo 255400, Shandong, Peoples R China

年份：2012

卷号：358

起止页码：10

外文期刊名：JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000304429800002)】；

基金：The authors thank for the financial support by Key Projects in the National Science & Technology Pillar Program during the 11th Five-Year Plan Period (2007BAE50B04) and Qilu Branch Co., SINOPEC. This work is also financially supported by the Research Program of the State Key Laboratory of Chemical Engineering, the Program of Introducing Talents of Discipline to Universities (B08021) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Phillips CrOx/SiO2 catalyst; S-2 catalyst; Inorganic and organic hybrid; chromium-based catalyst; Ethylene polymerization

摘要：In this work, a novel SiO2-supported hybrid chromium-based catalyst for ethylene and ethylene/1-hexene polymerization was prepared by using the residual surface hydroxyl groups in Phillips catalyst to further support bis(triphenysilyl) chromate (BC) in order to get the merits from two important chromium-based catalysts namely inorganic Phillips and organic S-2 catalysts. By characterization of the catalysts, investigation of the polymerization behavior and the microstructures of polymers, several vital factors such as cocatalyst, the addition amount of BC, calcination temperature, total chromium loading, polymerization temperature, pressure and hydrogen were systematically investigated. The proper addition weight amount of BC was Cr-Bc <= 0.25 wt%. The suitable calcination temperature and total chromium loading were <= 600 degrees C and <= 0.5 wt%, respectively. With increasing the relative addition amount of Cr-Bc from 0 to 20, 50, 80 and 100 wt% (corresponding from Phillips to HCat-1, HCat-2, HCat-3 and S-2 catalysts), the copolymerization abilities of the above catalysts showed a decreasing tendency. By comparing different chromium catalysts. HCat-2 catalyst showed higher activity than S-2 catalyst and its polymer had higher average molecular weight (MW) than that obtained from Phillips catalyst. HCat-2 catalyst got well-balanced properties mainly including activity, MW of polymers and copolymerization ability. (C) 2012 Elsevier B.V. All rights reserved.