Continuous catalytic hydrodechlorination of polychlorinated biphenyls (PCBs) in transformer oil
- Continuous catalytic hydrodechlorination of polychlorinated biphenyls (PCBs) in transformer oil
- BAMBANG VERIANSYAH; 최혜민; 이윤우; 강정원; 김재덕; 김재훈
- Transformer oil; PCBs; continuous hydrodechlorination
- Issue Date
- Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering
- VOL 44, NO 14, 1538-1544
- Continuous catalytic hydrodechlorination of polychlorinated biphenyls (PCBs) in the presence of transformer oils was carried out
in a fixed bed reactor using a 57.6 wt% Ni on silicon oxide-aluminum oxide (SiO2-Al2O3) catalyst. Reaction temperatures ranging
150–300℃, PCBs concentrations ranging 50–200 ppm, and reaction times ranging 1–8 h were tested. At a higher reaction temperature
or at a lower PCBs concentration, catalytic activity was higher and complete dechlorination of PCBs resulted even at long reaction
time. Catalyst regeneration using hexane and 0.1 M sodium hydroxide (NaOH) was effective to restore the catalytic activity. Fresh,
spent and regenerated catalysts were characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis.
XRDanalysis revealed growth of Ni crystallite size of the spent and the regenerated catalysts. XPS analysis showed that a considerable
amount of chlorine and carbon species were deposited on the surface of the spent catalyst, which may play a role in the catalysts
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