Catalytic degradation of mixed plastics using natural clinotilolite catalyst

摘要

Catalyti cdegradation of the mixture of polyethylene(PE),polypropylene(PE),polypropylene (PP),and polystyrene(PS) was investigated in a semi-batch reactor.the main degradaton product was liquid oil with gasoline range carbon number distributions.Clinoptilolite,a natural zeolite (HNZ) showed as good a catalytic performance as slica-alumina(SA).The protonated catalysts (HNZ,HZSM-5) showed an increased production tempratureresulted in a decrease of ethylbenzene and propylbenzene,but an increase of styrene.Themogravimetric analysis revealed that the increased degradation rate in the mixed plastics came from the intermolecular carbenium ion transfer between the degraded fragments of PE,PP,and PS.