Catalytic Co-pyrolysis Of Cellulose And Polyethylene

With the rapid consumption of fossil resources and the increase of energy demand,more and more researchers have been focusing on biomass energy.Pyrolysis technology is a clean and efficient thermal conversion method that can convert biomass into bio-oil and chemicals.However,bio-oil produced by biomass pyrolysis has high oxygen content,low calorific value,high viscosity,and cannot be used directly.The catalytic co-pyrolysis of biomass and waste plastics is a promising technology for the conversion of biomass into valuable aromatic and olefin.In this paper,on the basis of the catalytic co-pyrolysis characteristics of cellulose and polyethylene,the product components and contents of the catalytic copyrolysis of cellulose and polyethylene and the reaction mechanism in the catalytic co-pyrolysis process were further studied,and the C-HZSM-5 was modified to obtain the catalyst of C-HZSM-5.The main research of this paper are as follows:(1)The pyrolysis characteristics of cellulose and polyethylene were studied by thermogravimetric analysis.The experimental results showed that there was a weak synergetic effect in the co-pyrolysis process and the addition of HZSM-5 promoted the synergistic action between cellulose and polyethylene.(2)Py-GC /MS technology was used to study the distribution of co-pyrolysis products catalyzed by cellulose and polyethylene and HZSM-5 was modified according to the characteristics of catalytic pyrolysis.The results showed that the addition of HZSM-5 greatly reduced the content of oxygencontaining compounds in the pyrolysis products,and the proportion of oxygen-containing compounds decreased from 92.8% to 28.3%.While the content of ketones,esters,aromatics,alkenes and alkanes increased.The content of mesoporous of C-HZSM-5 was higher than that of conventional HZSM-5.(3)The mechanism of catalytic co-pyrolysis of cellulose and polyethylene was studied by combining Infrared Thermogravimetry with Density Functional Theory(DFT).Experimental and computational results showed that the addition of HZSM-5 promoted the formation of olefins.By combining DFT calculation and experiment,the reaction mechanism of co-pyrolysis of cellulose and polyethylene was studied more accurately,which provided a good theoretical basis for further study.