The production of debrominated aromatics via the catalytic pyrolysis of flexible printed circuit boards

被引:13
|
作者
Pyo, Sumin [1 ]
Kumar, Avnish [2 ]
Khan, Moonis Ali [3 ]
Jeon, Byong-Hun [4 ]
Choi, Siyoung Q. [1 ]
Kim, Young-Min [5 ]
Park, Young-Kwon [2 ]
机构
[1] Korea Adv Inst Sci & Technol KAIST, Dept Chem & Biomol Engn, Daejeon 34141, South Korea
[2] Univ Seoul, Sch Environm Engn, Seoul 02504, South Korea
[3] King Saud Univ, Coll Sci, Chem Dept, Riyadh 11451, Saudi Arabia
[4] Hanyang Univ, Dept Earth Resources & Environm Engn, Seoul, South Korea
[5] Daegu Univ, Dept Environm Engn, Gyongsan 38453, South Korea
基金
新加坡国家研究基金会;
关键词
Flexible printed circuit board; Zeolites; Basic metal oxides; Aromatics; Debromination; THERMAL-DECOMPOSITION; CO-PYROLYSIS; OIL; CAO; WASTE; MGO; MICROALGAE; OXYGEN; PCBS; FE;
D O I
10.1016/j.cej.2023.144783
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Pyrolysis is an environmental technology for the proper treatment of electronic waste (e-waste) for the production of fuel. However, the presence of brominated compounds in pyrolysis oil makes its commercialization difficult. In this study, various types of zeolites, HY (30), HZSM-5 (30), HZSM-5 (50), HZSM-5 (280), and basic metal oxides (MgO and CaO) were used for the pyrolysis of flexible printed circuit boards (FPCBs) for the first time to produce bromine-free oil. A higher production efficiency of debrominated aromatic hydrocarbons, primarily benzene, toluene, ethylbenzene, xylenes (BTEXs), and naphthalene with zeolites, was achieved over basic metal oxides. The use of HZSM-5 (HZ) (30) increased the amount of benzene (an area of 31.5 x 107) and toluene (an area of 17.6 x 107), and a high debromination efficiency was observed for basic metal oxides owing to the strong affinity of halides toward the Ca2+ and Mg2+ ions. Among the BTEXs, benzene (an area of 31.5 x 107) and toluene (an area of 17.6 x 107) were obtained as highly selective monoaromatics in the presence of the catalyst HZ (30). CaO and HZ (30) were effective for debromination and aromatic production, respectively. The in-situ CaO/ex-situ HZ (30) combination revealed - 100% debromination efficiency; however, the total aromatic hydrocarbon production was higher on the in-situ HZ (30)/ex-situ CaO with - 77.5% debromination efficiency. Meanwhile, the in-situ HZ (30)/ex-situ CaO configuration could achieve - 100% debromination efficiency by increasing the amount of CaO to 7 times to feed.
引用
收藏
页数:14
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