The Investigation Of Catalysis And Preparation Of Metal Oxide Used For PET Depolymerization Under Microwave Irradiation

Poly(ethylene terephthalate) (PET) is widely used in the manufactur -e. The recycling of waste PET is a prominent object. The recycling and utilization of PET gets more and more attention. Lots of study was done about the recycling of PET in the pure water system under the microwav -e ,and made a noteworthy achivement.In this thesis, the law of catalytic effect on the depolymerization of PET by metal oxides under microwave irradiation was researched system -atically. The law was studied from the perspective of the oxide structure and acid and alkaline. The study shows that the stronger of the oxide acidic alkaline of metal, the better catalytic effect. Meanwhile, the crystal structure of metal oxide was a factor for its catalytic capability. In the process of researching, according to our work, several kinds of composite oxide catalysts of Zn series were prepared by coprecipitation and the diagnosis of inorganic solid consistency. The product were characterized by XRD and the product can be determined is the target product by XRD. At the same time, the catalytic effects of different complex metal oxide for PET depolymerization under the microwave irradiation was investig -ated.The residue of PET was characterized by IR, SEM and GPC etc. Composite metal oxide catalyst was selected by the experiments.As a result, The composite metal oxide, ZnO?SrO ,has the best catalytic effect. At the same moment, the best PET depolymerization's condtion under the ZnO?SrO was obtained by orthogonal experime -nt, and its effect on the impact of PET catalyzed depolymerization under the microwave irrad -iation was studied.After that we discussed the mechanism among microwave energy, mixed metal oxides and PET during depolymerization process.Our current study showed that the stronger the acidity and alkaline of metal oxides is, the better catalytic effect they are.The composite metal oxide catalyst that we studied of Zn's series have certain catalytic effect on the depolymerization of PET under microwave irradiation and their catalytic effects have Causality with regular and random PET depolym -erization.ZnO?SrO has better catalytic effect on the impact of depolym -erization of PET under microwave irradiation.