The difference in products formed from precursors by catalytic activity of fly ash under an inert atmosphere of nitrogen and an oxygen-rich atmosphere of high purity air were examined. Replacement of nitrogen with air affected a shift to the higher chlorinated isomers being formed and also resulted in a greater overall yield of both PCDD and PCDF. A series of diphenylethers with different levels of chlorine substitution at varying positions were studied in the catalytic formation of PCDD and PCDF. All the precursors formed at least some PCDD and PCDF congeners, but the yields and isomer distributions varied with the structure of the precursor. The temperature dependance of product yield and congener distribution at low temperatures (200-350°C) is also presented. © 1989.
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