Veriansyah, Bambang Choi, Hye-Min Lee, Youn-Woo Kang, Jeong Won Kim, Jae-Duck Kim, Jaehoon 2024-01-20T20:05:22Z 2024-01-20T20:05:22Z 2021-09-03 2009-12 1093-4529 https://pubs.kist.re.kr/handle/201004/131941 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 degrees C, 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. XRD analysis 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. English TAYLOR & FRANCIS INC GAS-PHASE HYDRODECHLORINATION SUPERCRITICAL CARBON-DIOXIDE SUPPORTED NICKEL HYDROGEN CHLOROBENZENE DEGRADATION TEMPERATURE HYDRODEHALOGENATION DESTRUCTION NI/SIO2 Continuous catalytic hydrodechlorination of polychlorinated biphenyls (PCBs) in transformer oil Article 10.1080/10934520903263421 1 JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, v.44, no.14, pp.1538 - 1544 JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 44 14 1538 1544 scie scopus 000271611300007 2-s2.0-77952561748 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article HYDRODEHALOGENATION DESTRUCTION NI/SIO2 GAS-PHASE HYDRODECHLORINATION SUPERCRITICAL CARBON-DIOXIDE SUPPORTED NICKEL HYDROGEN CHLOROBENZENE DEGRADATION TEMPERATURE Transformer oil PCBs continuous hydrodechlorination