Affiliation:
1. Department of Chemistry Zhejiang Sci‐Tech University Hangzhou 310018 P. R. China
2. Apalene Technology Co., Ltd. Hangzhou 311113 P. R. China
Abstract
AbstractThe bis(imino)pyridyl iron‐based ethylene oligomerization catalysts have the advantages of mild reaction conditions, high activity and high selectivity to linear α‐olefins. However, barriers, such as high polymer content in the product mixture and large methylaluminoxane (MAO) dosage, are still limitations for the development of these systems at the industrial scale. In this study, new cocatalysts are prepared by the reaction of alkylaluminums with urea and its derivatives, and successfully used to activate iron‐based catalysts. It is found that the type and molar ratio of alkylaluminum and urea have significant influence on the performance of the cocatalysts. The activity of the preferred triisobutylaluminum/urea activated systems reaches more than 3.0 × 108 g (mol‐Fe)−1 h−1, and the polymer content can be controlled to be less than 2 wt.%. Notably, the catalytic system exhibits good high temperature stability, the activity can still reach 1.0 × 108 g (mol‐Fe)−1 h−1 even at 120 °C. Further 1H NMR studies show that alkylaluminum can react with the NH moieties of urea, forming complex alkylaluminum clusters, even aluminoxane‐like structures. This study offers a promising family of cocatalysts, making it possible to simultaneously improve their performance and reduce their cost.
Subject
Polymers and Plastics,General Chemical Engineering,General Chemistry
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献