Continuous catalytic hydrodechlorination of polychlorinated biphenyls (PCBs) in transformer oil

Title
Continuous catalytic hydrodechlorination of polychlorinated biphenyls (PCBs) in transformer oil
Authors
BAMBANG VERIANSYAH최혜민이윤우강정원김재덕김재훈
Keywords
Transformer oil; PCBs; continuous hydrodechlorination
Issue Date
2009-12
Publisher
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering
Citation
VOL 44, NO 14, 1538-1544
Abstract
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 deactivation.
URI
http://pubs.kist.re.kr/handle/201004/36988
ISSN
1093-4529
Appears in Collections:
KIST Publication > Article
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