Reactions of 2,4,6-trichlorophenol on model fly ash: oxidation to CO and CO2, condensation to PCDD/F and conversion into related compounds

Thermal treatment of 2,4,6-trichlorophenol on a magnesium silicate-based mo del fly ash in the temperature range between 250 degreesC and 400 degreesC leads predominantly to carbon monoxide and carbon dioxide. The Traction of 2,4,6-trichlorophenol which is oxidized to CO and CO2 increases from 3%, at 250 degreesC to 75% at 300 degreesC. Further products are polychlorinated benzenes, dibenzo-p-dioxins, dibenzofurans and phenols. The homologue and i somer patterns of the chlorobenzenes suggest chlorination in the ipso-posit ion of the trichlorophenol. The formation of PCDD from 9,4,6-trichloropheno l and 2,3,4,6-tetrachlorophenol on municipal solid waste incinerator fly as hes and model fly ash were compared and the reaction order calculated. (C) 2001 Elsevier Science Ltd. All rights reserved.