| Title | H2-free Plastic Conversion: Converting PET back to BTX by Unlocking Hidden Hydrogen |
|---|---|
| ID_Doc | 26141 |
| Authors | Lu, SL; Jing, YX; Feng, B; Guo, Y; Liu, XH; Wang, YQ |
| Title | H2-free Plastic Conversion: Converting PET back to BTX by Unlocking Hidden Hydrogen |
| Year | 2021 |
| Published | Chemsuschem, 14, 19 |
| Abstract | The strong desire for a circular economy makes obtaining fuels and chemicals via plastic degradation an important research topic in the 21st century. Here, the first example of the H-2-free polyethylene terephthalate (PET) conversion to BTX (benzene, toluene and xylene) was achieved by unlocking hidden hydrogen in the ethylene glycol part over Ru/Nb2O5 catalyst. Among the whole process (hydrolysis, reforming and hydrogenolysis/decarboxylation), the parallel hydrogenolysis and decarboxylation were competing and the rate-determining step. Ru/Nb2O5 exhibited superior hydrogenolysis and poorer decarboxylation performance in direct comparison with Ru/NiAl2O4, accordingly contributing to the distinct selectivity to alkyl aromatics among BTX. Ru species on Nb2O5, unlike those on NiAl2O4, showed more Ru delta+ species owing to the strong interaction between Ru and Nb2O5, restricting the undesired decarboxylation. Along with NbOx species for C-O bond activation, excellent reactivity towards the H-2-free conversion of PET back to BTX with alkyl aromatics as dominant species was achieved. This H-2-free system was also capable of converting common real PET plastics back to BTX, adding new options in the circular economy of PET. |
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