Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 3, Issue 2, Pages 340-348Publisher
AMER CHEMICAL SOC
DOI: 10.1021/sc5007522
Keywords
Transition metal-containing ionic liquids; Catalyze; Glycolysis; Poly(ethylene terephthalate); Mechanism
Categories
Funding
- Program of National High Technology Research and Development Program of China [2012AA063001]
- National Natural Science Foundation of China [21276255]
- Shandong Province Natural Science Foundation [ZR2014BQ018]
- Beijing Natural Science Foundation of China [2131005, 2132055]
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First-row transition metal-containing ionic liquids (ILs) were synthesized and used to catalyze the degradation of poly(ethylene terephthalate) (PET) in ethylene glycol (EG). One important feature of these IL catalysts is that they have good thermal stability, and most of them, especially [bmim](2)[CoCl4] (bmim = 1-butyl-3-methyl-imidazolium) and [bmim](2)[ZnCl4], exhibit higher catalytic activity, compared with traditional catalysts, conventional IL catalysts, and some functional ILs. For example, utilizing [bmim](2)[CoCl4] as catalyst, the conversion of PET, selectivity of bis(hydroxyethyl) terephthalate (BHET), and mass fraction of BHET in products reach up to 100%, 81.1%, and 95.7%, respectively, under atmospheric pressure at 175 degrees C for only 1.5 h. Another important feature is that BHET can be easily separated from these IL catalysts and has high purity. Moreover, recycling results show that [bmim](2)[CoCl4] worked efficiently after being used six times. These all show that [bmim](2)[CoCl4] is an excellent IL catalyst for the glycolysis of PET. Finally, based on in situ IR spectra and experimental results, the possible mechanism of degradation with synthesized IL is proposed.
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