Catalytic depolymerization of waste polyethylene terephthalate plastic in supercritical ethanol by ZnO/?-Al2O3 catalyst

被引：18
|
作者：
Yang, Yayong [1 ]
Chen, Feng [1 ]
Shen, Tianchi [1 ]
Pariatamby, Agamuthu [3 ]
Wen, Xiaoqiang [1 ]
Yan, Mi [1 ,2 ]
Kanchanatip, Ekkachai [4 ,5 ]
机构：
[1] Zhejiang Univ Technol, Inst Energy & Power Engn, Hangzhou 310014, Peoples R China
[2] Zhejiang Univ Technol, Zhejiang Carbon Neutral Innovat Inst, Hangzhou 310014, Peoples R China
[3] Sunway Univ, Jeffrey Sachs Ctr Sustainable Dev, Bandar Sunway 47500, Malaysia
[4] Kasetsart Univ Chalaermphrakiat Sakon Nakhon Prov, Fac Sci & Engn, Dept Civil & Environm Engn, Sakon Nakhon 47000, Thailand
[5] Thammasat Univ, Fac Engn, Ctr Excellence Environm Catalysis & Adsorpt, Pathum Thani 12120, Thailand
来源：
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION | 2023年 / 173卷
基金：
中国国家自然科学基金;
关键词：
Waste PET; Diethyl terephthalate; Supercritical ethanol; ZnO; Recycling; POLY(ETHYLENE-TEREPHTHALATE); PET; DEGRADATION; TEMPERATURE;
D O I：
10.1016/j.psep.2023.04.001
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In order to minimize the environmental impact from polyethylene terephthalate (PET) plastic waste, catalytic depolymerization was employed to break down PET into useful diethyl terephthalate (DET) monomers. This research investigated the depolymerization of waste PET in supercritical ethanol (SCE) catalyzed by ZnO/gamma-Al2O3 catalysts. The effect of the types of gamma-Al2O3 (neutral and acidic) support, ZnO loading and catalyst dosage were studied. The catalytic efficiency of the catalysts was evaluated by the yield of DET obtained from the catalytic depolymerization of waste PET in SCE at 270 degrees C and 60 min reaction time. The results revealed that the highest DET yield of 92.2% could be obtained with 7.5 wt% ZnO supported on acidic gamma-Al2O3 with catalyst dosage of 5% by weight of waste PET. NMR analysis indicated that the catalytic depolymerization process was complete since there were no PET polymer residues in the liquid. In addition, the ZnO/gamma-Al2O3 catalyst also had good stability after five cycles of reuse, its catalytic activity was still satisfactory. The findings suggested that catalytic depo-lymerization in SCE is a promising alternative for converting waste PET into valuable materials.
引用
收藏
页码：881 / 892
页数：12
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