Detoxification of PCBs Containing Transformer Oil by Catalytic Hydrodechlorination in Supercritical Fluids
- Detoxification of PCBs Containing Transformer Oil by Catalytic Hydrodechlorination in Supercritical Fluids
- 최혜민; 김재훈; 김재덕; 강정원
- 초임계유체; 수첨탈염소화; PCBs; Supercritical fluid; Hydrodechlorination
- Issue Date
- 청정기술; Clean technology.
- VOL 15, NO 1, 9-15
- Catalytic hydrodechlorination of PCBs (polychlorinated biphenyls) included in the transformer oil was carried out to detoxify PCBs and to recycle the treated oil. Catalysts such as 0.98 wt% Pt and 0.79 wt% Pd on γ-alumina (γ-Al2O3) support, 12.8 wt% Ni on γ-Al2O3, and 57.6 wt% Ni on silica-alumina (SiO2-Al2O3) support were used for the catalytic hydrodechlorination. Various supercritical fluids such as carbon dioxide, propane and isobutane were used as reaction media. The effects of reaction temperature, reaction time, catalysts, and supercritical fluids on the catalytic hydrodechlorination were examined in detail. The detoxification degree increased in the order of Ni > Pd > Pt. This is possibly due to higher metal loading and larger metal size of the Ni catalyst. Below 175℃, scCO2 was found as the most effective reaction media for the catalytic hydrodechlorination of PCBs included in the transformer oil.
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