کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7823889 | 1502857 | 2018 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High-efficiency glycolysis of poly(ethylene terephthalate) by sandwich-structure polyoxometalate catalyst with two active sites
ترجمه فارسی عنوان
گلیکولیزاسیون با کارایی بالا از پلی (اتیلن تترفاتال) با کاتالیزور پلیوکسی متالول با ساختار ساندویچ با دو محل فعال
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
پلی اتیلن ترفتالات گلیکولیز، کاتالیزور، ساختار ساندویچ، پلی ساکارزین
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
Catalyst in the process on glycolysis of poly (ethylene terephthalate) (PET) wastes is a significant critical factor, which determine the efficiency and the cost of PET degradation. In this study, a kind of transition-metal-substituted polyoxometalates (POMs) Na12 [WZnM2(H2O)2(ZnW9O34)2] (Mâ¯=â¯Zn2+, Mn2+, Co2+, Cu2+, Ni2+) which have a sandwich-structure and more than two transition metal active sites show excellent catalytic performance in the glycolysis of PET under mild conditions. We investigated the effects of temperature, reaction time and catalyst amount on PET degradation and obtained the glycolysis optimal conditions. The PET could be fast and completely degraded at 190â¯Â°C for 40â¯min with low catalyst/PET molar ratio (0.018%) and high PET/Ethylene Glycol (EG) weight ratio (1:4), and the yield of bis(hydroxyethyl) terephthalate (BHET) is higher than 84.5%. After four-times recycling, the conversion of PET and the yield of BHET can still reach 100% and 84.5%. The exact structure of POMs Na12 [WZnM2(H2O)2(ZnW9O34)2] is confirmed by Single Crystal X-ray Diffraction (SC-XRD). Compared with traditional heteropolyacid catalysts, this catalyst possessed of at least two transition metal active sites, which lead to its an excellent catalytic capacity. The possible coordination activates mechanism for PET glycolysis is also proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 156, October 2018, Pages 22-31
Journal: Polymer Degradation and Stability - Volume 156, October 2018, Pages 22-31
نویسندگان
Pengtao Fang, Bo Liu, Junli Xu, Qing Zhou, Suojiang Zhang, Junying Ma, Xingmei lu,