☆ 4.7 Article

Debrominated high quality oil production by the two-step catalytic pyrolysis of phenolic printed circuit boards (PPCB) using natural clays and HY

JOURNAL OF HAZARDOUS MATERIALS (2019)

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Journal

JOURNAL OF HAZARDOUS MATERIALS
Volume 367, Issue -, Pages 50-58

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.12.040

Keywords

Phenolic-printed circuit board; Oil upgrade; Debromination; Dolomite; HY

Categories

Engineering, Environmental Environmental Sciences

Funding

  1. National Research Foundation of Korea (NRF) - Korea government (MSIT) [2018R1A2B2001121]
  2. National Research Foundation of Korea [2018R1A2B2001121] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The two-step catalytic pyrolysis (CP) of a phenolic-printed circuit board (PPCB) over in-situ natural clays (dolomite, bentonite, and olivine) and ex-situ HY(30, SiO2/Al2O3: 30) was investigated by tandem micro reactor-gas chromatography/mass spectrometry. The non-catalytic pyrolysis (NCP) of PPCB produced oxygenated, phosphorous, and brominated compounds due to the presence of paper, tetrabromo bisphenol A (TBBA), phosphorous flame retardants, and phenol resin in the PPCB. Among the natural clays, dolomite showed the highest debromination and aromatics formation efficiency during the in-situ CP of PPCB followed by bentonite and olivine owing to the different catalyst properties. Two-step CP of PPCB over in-situ natural clays and ex-situ HY (30) achieved higher efficiency on the formation of higher quality oil (mono-phenol and aromatic hydrocarbons) with a lower Br content than the one-step CP of PPCB. Among the two-step catalysts, the combination of in-situ dolomite and ex-situ HY(30) provided the highest quality oil production due to the high acidity and sufficiently large pore size of dolomite. Two-step CP of PPCB over in-situ dolomite and ex-situ HY(30) also revealed a longer lifetime than the one-step CP of PPCB over ex-situ HY(30), not only for the formation of aromatic hydrocarbons and mono-phenols, but also for debromination.

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