Abstract
Air containing 200-1000 ppm of Aroclor 1254 vapors (a mixture of polychlorinated biphenyls (PCBs)) was passed through a 22.86 cm long heated section of 0.64 cm i.d. monolithic {alpha}-alumina support, which had been previously treated with one or more catalytic agents. At 600{degree}C, with a residence time of about 9.4 s, results showed that the overall PCB destruction efficiency ranged from a high of 97.3% for supported CuO to a low of 69.3% for Cr{sub 2}O{sub 3}. Supported catalysts of Co{sub 3}O{sub 4}, CuCr{sub 2}O{sub 4}, and Pt-Pd were intermediate in activity. Relative activity for this group of p-type catalysts in deep oxidation was in accordance with Sabatier's principle, decreasing with increasing heats of O{sub 2} chemisorption. Selectivity toward oxidation of the more toxic high-chlorine-containing PCBs was found to be greater for catalysts made from transition metal oxides than for noble metal systems or homogeneous (thermal) decomposition.
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