Preparation Of One-dimensional Metal-organic Coordination Polymers For Ethylene Oligomerization

?-Olefin is an important organic chemical raw material.It can be used to synthesize advanced lubricant base oils,additives for fuel oils and lubricants,important chemical products such as high-performance plastics,advanced surfactants,and organic agents.With the rapid development of the petrochemical industry,the market demand continues to increase,and the demand for?-olefins is growing rapidly.The ethylene oligomerization method,as one of the important methods for the production of low-carbon?-olefins,has received great attention.In this paper,four kinds of one-dimensional nickel-based metal-organic coordination polymers including 1D-S-Ni(single nickel node),1D-D-Ni(double-nickel node),1D-M-Ni(multi-nickel node),and 1D-Co-Ni(heteronuclear cobalt-nickel node)were successfully hydrothermally synthesized and characterized by a series of characterization techniques.After heat treatment in vacuum,a series of activated metal organic coordination polymers catalysts were obtained.The effects of treatment temperature,cocatalyst,the distance and number of metal centers,reaction pressure,reaction temperature,reaction time,on the catalytic performance of the catalysts were investigated.The experimental results show that 1D-S-Ni,1D-D-Ni,and 1D-M-Ni catalysts mainly catalyze ethylene selective dimerization,with the main oligomerization products being C₄,wherein 1D-D-Ni has the highest activity,up to 1.71×10⁶ g·mol^-1·h^-1.The activity of the 1-D-Co-Ni catalyst reaches 4.43×10⁵ g·mol^-1·h^-1,but the oligomerization products are mainly C₈,with the selectivity of 81.07%.