Abstract
The formation of polychlorinated dibenzo- p -dioxins and polychlorinated dibenzofurans (PCDD/Fs) from2-chlorophenol on supported copper oxide catalyst was studied over the temperature range 200–500°C and a contact time of 0.17–0.5 s under pyrolytic conditions. It was found that despite the pyrolytic conditions, the majority of 2-chlorophenol undergoes oxidation to CO and CO 2 . Approximately 0.5% of 2-chlorophenol was converted to PCDD/F. The results are consistent with a Langmuir-Hinshelwood mechanism for PCDF formation and an Eley-Rideal mechanism of formation of PCDD. Only one PCDF isomer was observed, 4,6-dichlorodibenzofuran, while substantial concentrations of highly chlorinated PCDD were detected. This observation can be explained by a mechanism of formation involving a surface-bound PCDD intermediate that can be further chlorinated. PCDFs are desorbed upon formation and are consequently not chlorinated.
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