PYROLYSIS CHARACTERISTICS AND KINETIC ANALYSIS OF COMMON PLASTICS
The study on pyrolysis characteristics of plastic waste is in favor of achieving its clean and efficient conversion and utilization.The catalytic pyrolysis characteristics of high-density polyethylene(HDPE),low-density polyethylene(LDPE),and polypropylene(PP),with three different catalysts of HZSM-5,Hβ and HUSY,were investigated by the thermogravimetric experiments at different heating rates of 10,20,30,40,50 ℃/min.The increase of heating rate caused thermal hysteresis,and the different types of catalysts had different effects on the improvement of pyrolysis rates of the HDPE,LDPE,and PP.In order to provide theoretical support,three kinetic modeling analysis methods,including Coats-Redfern(CR),Flynn-Wall-Ozawa(FWO),and distributed activation energy model(DAEM),were used to calculate the kinetic parameters of HDPE,LDPE,and PP pyrolysis under different conditions.CR method verified that each pyrolysis reaction was following the first-order reaction model and found that the catalysts could significantly reduce the activation energy of the reaction.The calculated activation energy by two iso-conversion rate methods,including the FWO method and DAEM,was similar to each other.The DAEM model,including the kinetic compensation effect,showed that the activation energy increased and then decreased as the conversion rate(α)increases,and reached the highest at α=40％～50％.
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