Formation of PCDD/F from the pyrolysis of 2-chlorophenol on the surface of dispersed copper oxide particles

Document Type

Article

Publication Date

1-1-2002

Abstract

The formation of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) from 2-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 CO2. 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.

Publication Source (Journal or Book title)

Proceedings of the Combustion Institute

First Page

2463

Last Page

2468

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