MWCNTs-Co(Ⅱ)and Pd(Ⅱ)were prepared through graft-ing silylated-salicylaldimine Pd(Ⅱ)and Co(Ⅱ)on multi-walled carbon nanotubes(MWCNTs)for ethylene oligomerization.The structures of the two MWCNTs-supported catalysts were characterized by means of scanning electron micros-copy(SEM),X-ray diffraction(XRD),Fourier transform infrared(FTIR)spectroscopy,thermogravimetric analyses(TGA)and nitrogen ad-sorption and desorption.And the influence of the supported pattern on the catalytic properties for ethylene oligomerization was investi-gated.The results revealed that the silylated-salicylaldimine com-plexes were grafted on the inner and outer surfaces of the carbon nanotubes and the pore size and BET surface area of MWCNTs de-creased.Compared with the homogeneous catalysts,the two MWCNTs-supported catalysts had higher selectivity for hexene and 1-hexene in the presence of diethylaluminum chloride(DEAC)with a small molecule size due to confinement effect.MWCNTs-Pd exhi-bited higher activity and higher selectivity for C8+olefin compared to MWCNTs-Co due to electronic factors.The catalytic activities of MWCNTs-Pd and MWCNTs-Co decreased from 24.18×105 g·(mol Pd·h)-1 and 20.57×105 g·(mol Co·h)-1 to 19.79×105 g·(molPd·h)-1 and 13.14×105 g·(mol Co·h)-1 after the third recycle reaction,respec-tively.

XUE Jingqi;Li Feng;ZHAI Xue;LI Dan;GUO Lijun;Li Cuiqin

Provincial Key Laboratory of Oil&Gas Chemical Technology,College of Chemistry&Chemical Engineering,Northeast Petroleum University,Daqing 163318,P.R.China

高等学校化学研究（英文版）

[1]XUE Jingqi;Li Feng;ZHAI Xue;LI Dan;GUO Lijun;Li Cuiqin-.Multiwalled Carbon Nanotubes Modified with Silylated-salicylaldimine Co(Ⅱ)and Pd(Ⅱ)Complexes as Precatalysts in Ethylene Oligomerization)[J].高等学校化学研究（英文版）,2022(02):552-561

Multiwalled,Silylated,salicylaldimine,Precatalysts,Oligomerization,diethylaluminum,bited,C8+olefin,molPd

Carbon,Nanotubes,Modified,Complexes,Ethylene,MWCNTs,were,prepared,through,silylated,multi,carbon,nanotubes,ethylene,oligomerization,structures,two,supported,characterized,by,means,scanning,micros,ray,diffraction,Fourier,transform,infrared,FTIR,spectroscopy,thermogravimetric,analyses,TGA,nitrogen,desorption,And,influence,pattern,catalytic,properties,was,investi,gated,results,revealed,that,grafted,inner,outer,surfaces,pore,size,BET,area,Compared,homogeneous,had,higher,selectivity,hexene,presence,chloride,DEAC,small,molecule,due,confinement,effect,exhi,activity,compared,electronic,factors,activities,decreased,from,after,third,recycle,reaction,respec,tively

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