论文部分内容阅读
线性α-烯烃是一类重要的化工原料,均相Cr系催化剂催化乙烯选择性齐聚制备特定的α-烯烃是近年来得到迅速发展的一个重要的研究方向,其中催化反应机理的研究对新型高效催化剂的研发具有重要的指导作用.综述了示踪原子、预制催化剂前驱体、EPR-XAS、密度泛函理论(DFT)计算等方法在乙烯选择性齐聚的反应路径和金属中心价态研究中的应用,总结了该催化反应机理研究中取得的最新成果,从方法学角度对各位学者的研究进行了比较与讨论,并在此基础上提出了双核Cr金属环机理研究的新观点,对进一步的研究方向进行了展望.
Linear α-olefins are an important class of chemical raw materials. Homogeneous Cr-based catalysts catalyze the selective oligomerization of ethylene to produce specific α-olefins. It is an important research direction that rapid development has been achieved in recent years. Among them, Efficient catalyst research and development has an important guiding role.In this paper, the reaction path and metal center valence state of selective oligomerization of ethylene are reviewed, including tracer atom, preformed catalyst precursor, EPR-XAS, density functional theory (DFT) , Summarizes the latest achievements made in the research of catalytic reaction mechanism, compares and discusses the researches of scholars from the perspective of methodology, and puts forward the new viewpoint of the research on the mechanism of the dual-core Cr metal ring based on this Further research directions are put forward.