Research On Catalytic Pyrolysis Of Automobile Shredder Residues Of Plastic Components

With the development of Chinese auto market,such a large number of cars will cause a sudden increase in the number of end-of-life vehicle?ELV?.Automobile Shredder Residue?ASR?from different districts possess different compositions,and how to dispose ASR efficiently has always been a hot topic in the ELV recycling industry.In this paper,plastic is one of the main components that remain stable in different ASR.Therefore,the plastic component in ASR was selected as the object of this study.Then,the pyrolysis kinetic relationship between ASR and their plastic components,which comprises a large proportion,was analyzed through thermogravimetric analysis?TGA?and with the Kissinger method.This study also selected three typical waste plastic board from ELVs as plastic samples for catalytic pyrolysis with nickel oxide?NiO?to determine whether a reduction in activation energy and an increase in combustible gas can be achieved through TGA with NiO and a pyrolysis test with NiO.Leaching and solidification tests of 8 sorts of heavy metals were carried out for solid residues from pyrolysis test.The curing effects of three curing agents,EDTA,SDD and NaH₂PO₄,were also compared.Results showed that the variation tendency of the activation energy of ASR was similar to that of its plastic component during TGA.The feasibility of applying NiO to plastic sample pyrolysis was verified theoretically with a laboratory-scale platform.NiO reduced the maximum activation energy maximum?E max?of some samples by 111.8 kJ/mol.The concentrations of H₂,C₂H₆,C₂H₄,C₃H₈ and C₃H₆ generated from the plastic samples with NiO were higher than those from the sample without NiO,risen by39.32%,40.57%,31.98%,47.32%and 37.23%.Meanwhile,the results of leaching and solidification tests indicated the leaching concentration of the eight heavy metals was significantly lower than that of the original.This analysis may provide a theoretical foundation for the design and development of a pyrolysis method that can treat different ASR according to their plastic components in future studies.