Co-circularity of spent coffee grounds and polyethylene via co-pyrolysis: Characteristics, kinetics, and products
Yükleniyor...
Dosyalar
Tarih
2023
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Spent coffee grounds (CG) and polyethylene (PE) are the two typical types of major solid wastes. Their co-pyrolysis may be leveraged to reduce their waste streams and pollution and valorize energy and by-products. In this study, their co-pyrolysis performances, interaction effects, kinetics, and products were characterized in response to the varying temperature and blend ratio. The co-pyrolysis exhibited the two main stages of (1) the degradation of CG (180-380 degrees C) and (2) the depolymerization of PE and the decomposition of lignin (380-550 degrees C). The pyrolysis performance rose from 1.34x10(-4)%(3)center dot min(-2)center dot degrees C-3 with the mono-pyrolysis of CG to 26.32x10(-4)%(3)center dot min(-2)center dot degrees C-3 with the co-pyrolysis of 10 % CG and 90 % PE. The co-pyrolysis of 70 % CG and 30 % PE (CP73) achieved a lower activation energy than did the mono-pyrolysis of the two fuels. The products of the CG pyrolysis included a large number of alcohols, ethers, ketones, esters, and other oxygen-containing compounds, with a proportion as high as 65.01 %. The products of CP73 at 550 degrees C resulted in the yields of hydrocarbons and alcohols up to 93.61 %, beneficial to the further utilization of the co-pyrolytic products. Not only did the co-pyrolysis valorize its products, but also it enhanced their co-circularity. Artificial neural network-based joint optimization showed CP73 in the range of 517-1000 degrees C as the best combination of the conditions. The study provides new insights into the co-pyrolytic disposal of spent coffee grounds and polyethylene so as to improve the waste stream reduction and the valorization of energy and products.
Açıklama
This research was financially supported by the National Natural Science Foundation of China (No. 51978175 & 42177196) , the Scientificand Technological Planning Project of Guangzhou, China (No. 202103000004) , Guangdong Province Science and Technology Plan-ning Project, China (NO.2022A0505050076) and Natural Science Foundation of Guangdong Province, China (No. 2022A1515010825 & 2019A1515012131) . We would like to thank Miss. Yang at the Analysis and Test Center of Guangdong University of Technology for her assis-tance with TG-FTIR analysis.
Anahtar Kelimeler
Coffee Grounds, Polyethylene, Co-pyrolysis, Py-GC/MS, Dynamic Optimization
Kaynak
Fuel
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
337
Sayı
Künye
Fu, J., Wu, X., Liu, J., Evrendilek, F., Chen, T., Xie, W., ... & He, Y. (2023). Co-circularity of spent coffee grounds and polyethylene via co-pyrolysis: characteristics, kinetics, and products. Fuel, 337, 127061.
