Dechlorination by catalytic transfer hydrogenation with supported transition metal catalysts
The pyrolysis recovery of waste plastics can not only avoid"white pollution",but also realize its high-value utilization.However,the removal of organic chlorine in plastic pyrolysis oil is an urgent problem to be solved.Highly active supported transition metal catalysts were prepared by incipient-wetness impregnation method for dechlorination by catalytic transfer hydrogenation(CTH)using isopropanol as the hydrogen donor,and the effects of catalyst composition,calcination temperature,reduction temperature,reaction temperature and the dosage of isopropanol on the dechlorination performances by CTH were investigated.The results showed that among different types of supported metal catalysts,1Pt/SiO2(Pt with mass fraction of 1％loading on SiO2)showed the best catalytic performance and the chlorine removal efficiency reached 73.3％.By doping 1Pt/SiO2 with appropriate content of Ni,its catalytic performance could be improved.The highest chlorine removal efficiency of 92.7％was achieved when Ni doping amount was 10％(mass fraction),calcination temperature was 400 ℃,reduction temperature was 350 ℃,reaction temperature was 100 ℃ and the molar ratio of isopropanol to organochlorine was 25∶1.The characterization results showed that the doping of Ni changed the electronic structure and dispersion of Pt on the catalyst surface.In addition,Ni had superior hydrogenation activity,which led to higher catalytic activity of the catalyst.
dechlorinationPtcatalystcatalytic transfer hydrogenationplastic pyrolytic oil
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