کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5201501 | 1502896 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fast and effective glycolysis of poly(ethylene terephthalate) catalyzed by polyoxometalate
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Fast and effective glycolysis of poly(ethylene terephthalate) catalyzed by polyoxometalate Fast and effective glycolysis of poly(ethylene terephthalate) catalyzed by polyoxometalate](/preview/png/5201501.png)
چکیده انگلیسی
Transition-metal-substituted polyoxometalates (POMs) K6SiW11MO39(H2O) (M = Zn2+, Mn2+, Co2+, Cu2+, Ni2+) show excellent catalytic activities in the glycolysis of poly(ethylene terephthalate) (PET) under mild conditions. The effects of temperature, catalyst amount and reaction time on PET degradation are investigated. The PET could be fast and completely degraded at low catalyst/PET molar ratio (0.13%) and high PET/EG weight ratio (1:4). The yield of bis(hydroxyethyl) terephthalate (BHET) exceeds 84% with the SiW11Zn as the catalyst under atmospheric pressure at 185 °C for 30 min. The catalyst and ethylene glycol (EG) can be easily separated from the products by filtration and can be reused together. After recycling eight times, the conversion of PET and the yield of BHET can still reach 100% and 83%, respectively. The possible nucleophilic substitution mechanism for PET glycolysis using the K6SiW11ZnO39(H2O) as the catalyst is proposed. The POM catalysts are hopeful to provide the possibility for other polymer degradation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 117, July 2015, Pages 30-36
Journal: Polymer Degradation and Stability - Volume 117, July 2015, Pages 30-36
نویسندگان
Yanrong Geng, Tao Dong, Pengtao Fang, Qing Zhou, Xingmei Lu, Suojiang Zhang,