Tuning Bis(imino)pyridyl Iron-Catalyzed Ethylene Oligomerization by Modification of MAO with p-BrPhOH
Tuning Bis(imino)pyridyl Iron-Catalyzed Ethylene Oligomerization by Modification of MAO with p-BrPhOH
复制标题
通过用 p-BrPhOH 修饰 MAO 来调节双（亚氨基）吡啶基铁催化乙烯齐聚
DOI：
10.1002/mren.201700061
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发表时间：
2018
影响因子：
1.5
通讯作者：
Ye Zhibin
中科院分区：
文献类型：
--
作者：
Zhang Wei;Ye Jian;Jiang Binbo;Wang Jingdai;Liao Zuwei;Huang Zhengliang;Yang Yongrong;Ye Zhibin
为了减少双(亚氨基)吡啶铁催化的乙烯齐聚反应中不溶聚合物的同时生成，本研究选择对溴苯酚(对溴苯酚)作为线性α-烯烃的最佳改性剂。结果表明，以对溴苯酚为改性剂，聚合物在总产物中所占的比例大大降低。该催化体系还具有较高的催化活性，液体产率保持较高的线性。此外，p-BrPhOH的引入提高了催化体系的高温稳定性，由于该催化体系可以在较高温度下催化乙烯齐聚，导致齐聚活性增强。用电子顺磁共振对催化体系的表征表明，p-BrPhOH的引入显著抑制了铁离子的形成，铁离子可能是产生不需要的不溶聚合物的主要活性中心，因此这在很大程度上可以延缓乙烯齐聚过程中不溶聚合物的产生。
To reduce the simultaneous production of insoluble polymers during the bis(imino)pyridyl iron‐catalyzed ethylene oligomerization, in this study,p‐BrPhOH (4‐bromophenol) has been chosen as the most optimal modifier for the production of linear α‐olefins. It is found that the polymer share in the total products is largely reduced with the use ofp‐BrPhOH as the modifier. The catalytic system also possesses a high activity with the liquid production maintained high level of linearity. Moreover, the introduction ofp‐BrPhOH promoted the high‐temperature stability of the catalytic system, leading to the enhanced oligomerization activity as the catalytic system can catalyze ethylene oligomerization at higher temperatures. A characterization of the catalytic system with electron paramagnetic resonance shows that introduction ofp‐BrPhOH significantly inhibits the formation of ferric ions, which can be the main active centers responsible for generating undesired insoluble polymers, thus this can largely retard the production of insoluble polymers during ethylene oligomerization.