Study on the Catalytic Performance and Its Kinetics of Ethylene Oligomerization Catalyzed by Pyridinimine Phthalocyanine Nickel Catalyst
A kind of novel pyridinimine phthalocyanine nickel catalyst was prepared with tetraamine nickel phthalocyanine,pyridine-2-carboxaldehyde and NiCl2·6H2O as the raw materials through the Schiff base reaction and the complex reaction.The structures were characterized by Fourier transform infrared(FTIR),ultraviolet-visible(UV-Vis),nuclear magnetic resonance(1H-NMR),inductively coupled plasma mass(ICP-MS),thermogravimetric differential scanning calorimeter(TG-DSC)and electrospray ionization mass(ESI-MS).The catalytic performance and the kinetic of ethylene oligomerization were investigated.The results showed that the catalytic activity could reach up to 8.82×105 g/(mol Ni·h)-1,and the selectivity of butene and hexene were 58.22％and 39.85％,respectively,when the cyclohexane was used as solvent,the MAO was used as co-catalyst,the catalyst molar concentration was 5 μmol/L,the oligomerization pressure was 1.0 MPa,the oligomerization temperature was 35 ℃ and Al/Ni molar ratio was 500.After the fitting calculation of the kinetics equation for ethylene oligomerization catalyzed by pyridinimine phthalocyanine nickel catalyst,it could be obtained that the order of the reaction to the catalyst molar concentration was 1.24,and that to oligomerization pressure was 0.95.The apparent activation energy of the reaction was 71.42 kJ/mol when the catalyst concentration was 5 pmol/L,the oligomerization pressure was 1.0 MPa,and the oligomerization temperature was 5-35 ℃.
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