Converting polycarbonate and polystyrene plastic wastes intoaromatic hydrocarbons via catalytic fast co-pyrolysis

JOURNAL OF HAZARDOUS MATERIALS

卷:386

Article

Wang, Jia^1,2,3,4  Jiang, Jianchun^1,2  Wang, Xiaobo⁵  Wang, Ruizhen^1,2  Wang, Kui^1,2  Pang, Shusheng⁶  Zhong, Zhaoping³  Sun, Yunjuan²  Ruan, Roger^7,8  Ragauskas, Arthur J.^4,9,10 

[1] Nanjing Forestry Univ, Coll Chem Engn, Jiangsu Coinnovat Ctr Efficient Proc & Utilisat F, Longpan Rd 159, Nanjing 210037, Peoples R China

[2] CAF, Inst Chem Ind Forest Prod, 16 Suojin Five Village, Nanjing 210042, Jiangsu, Peoples R China

[3] Southeast Univ, Minist Educ, Key Lab Energy Thermal Convers & Control, 2 Sipailou, Nanjing 210096, Jiangsu, Peoples R China

[4] Univ Tennessee, Dept Chem & Biomol Engn, Knoxville, TN 37996 USA

[5] Nanjing Xiaozhuang Univ, Sch Environm Sci, Nanjing 211171, Jiangsu, Peoples R China

[6] Univ Canterbury, Dept Chem & Proc Engn, Christchurch, New Zealand

[7] Univ Minnesota, Ctr Biorefining, 1390 Eckles Ave, St Paul, MN 55108 USA

[8] Univ Minnesota, Dept Bioprod & Biosyst Engn, 1390 Eckles Ave, St Paul, MN 55108 USA

[9] Univ Tennessee, Inst Agr, Ctr Renewable Carbon, Dept Forestry Wildlife & Fisheries, Knoxville, TN 37996 USA

[10] Oak Ridge Natl Lab, Biosci Div, Joint Inst Biol Sci, Oak Ridge, TN 37831 USA

关键词: Plastic polymers;    Bisphenol A polycarbonate;    Catalytic thermochemical conversion;    HZSM-5;    Monocydic aromatic hydrocarbons;   

DOI  :  10.1016/j.jhazmat.2019.121970

来源: Elsevier

【 摘 要 】

Thermochemical conversion of plastic wastes is a promising approach to produce alternative energy-based fuels. Herein, we conducted catalytic fast co-pyrolysis of polycarbonate (PC) and polystyrene (PS) to generate aromatic hydrocarbons using HZSM-5 (Zeolite Socony Mobil-5, hydrogen, Aluminosilicate) as a catalyst. The results indicated that employing HZSM-5 in the catalytic conversion of PC facilitated the synthesis of aromatic hydrocarbons in comparison to the non-catalytic run. A competitive reaction between aromatic hydrocarbons and aromatic oxygenates was observed within the studied temperature region, and catalytic degradation temperature of 700 degrees C maximized the competing reaction towards the formation of targeted aromatic hydrocarbons at the expense of phenolic products. Catalyst type also played a vital role in the catalytic decomposition of PC wastes, and HZSM-5 with different Si/Al molar ratios produced more aromatic hydrocarbons than HY (Zeolite Y, hydrogen, Faujasite). Regarding the effect of Si/Al molar ration in HZSM-5 on the distribution of monocyclic aromatic hydrocarbons (MAHs), a Si/Al molar ratio of 38 maximized benzene formation with an advanced factor of 5.1. Catalytic fast co-pyrolysis of PC with hydrogen-rich plastic wastes including polypropylene (PP), polyethylene (PE), and polystyrene (PS) favored the production of MAHs, and PS was the most effective hydrogen donor with a similar to 2.5-fold increase. The additive effect of MAHs increased at first and then decreased when the PC percentage was elevated from 30 % to 90 %, achieving the maximum value of 32.4 % at 70 % PC.

【 授权许可】

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