Study on design of polymeric ionic liquids and the performance for selective oxidation of cyclohexane
Different molecular weights of poly(vinylimidazole)were synthesized by using vinyl imidazole as a monomer and different amounts of initiators.Thermogravimetric(TG)analysis showed that the polymer had good thermal stability.A series of polymeric ionic liquids(PIL)were synthesized by quaternization of the optimal polymer with three different alkyl chain lengths:1-chlorooctadecane,1-chlorododecane,and 1-chlorohexane.The chemical structure and morphology of the polymeric ionic liquids were analyzed by Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),and contact angle testing.The catalytic performance of PIL-C18,PIL-C12,and PIL-C6 for selective cyclohexane oxidation was investigated.Furthermore,PIL-C12 was selected to conduct in-depth research on the influence of ion rates(PIL-C12-X,X=10,25,50,75,100)on catalytic performance.The results showed that the length of alkyl chain segment and the ionic ratio could effectively influence the hydrophobicity and active site of the catalysts to improve the performance with the conversion of 21.8%and selectivity of 41.5%for cyclohexane oxidation to adipic acid.
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