Preparation, Performance And Characterization Of Transition Metal Oxide Catalysts And Their Catalytic Degradation Of PET

Form aspects of green chemistry, environment protection and change waste to usefulmaterial, this paper focus on environment friendly, high performance catalyst for degradationof waste polyethylene terephthalate (PET). PET is the most used and the most waste plastic inour modern world. For the purpose of rising PET utilization ratio, the bi-hydroxyethylterephthalate (BHET) was recycled, which is the monomer for preparing PET.(1) There kinds of catalysts, zinc ferrite, nickel ferrite and manganese ferrite, weresynthesized by rheological method, which had different material ratio and were calcinated atdifferent temperature. The catalysts were characterized by TGA/DSC, XRD, SEM andspecific surface area to figure out the structure and property.(2) Glycol was used for degradation waste PET with three prepared types of ferritecatalysts. Those results show they worked well for the PET alcoholysis process. Under properdegradation condition, waste PET could conversion and the yield ratio of BHET was also veryhigh. Among these types of catalysts, the most effective catalyst was manganese ferrite, whichhad the highest BHET yield raio of79.19%under glycol condition at196℃for3hours, theyield ratio is79.19%. The ferrite we prepared have magnetic property, they can be recycledby a very easy way and re-use for degradation PET again.(3) Manganese dioxide was synthesized by rheological method and characterized byXRD、TG/DSC、SEM、BET. The best yield of BHET was74.28%when manganese dioxidefor alcoholysis PET under196℃for1hour. Compare with the ferrite catalysts under the samecondition, it can shorten the reaction time catalyzed by manganese dioxide.(4) The depolymerized product was confirmed as BHET by TG/DTG, IR,1HNMR, andMS.