- Title
- PCDD/F formation from heterogeneous oxidation of wood pyrolysates
- Creator
- Tame, Nigel W.; Dlugogorski, Bogdan Z.; Kennedy, Eric M.
- Relation
- Ninth International Symposium on Fire Safety Science. Fire Safety Science: Proceedings of the Ninth International Symposium (Karlsruhe, Germany 21-26 September, 2008) p. 1189-1200
- Publisher Link
- http://dx.doi.org/10.3801/IAFSS.FSS.9-1189
- Publisher
- International Association for Fire Safety Science
- Resource Type
- conference paper
- Date
- 2008
- Description
- This paper examines the formation of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/F) during oxidative pyrolysis of wood. Model lignocellulosic compounds and fractions isolated from wood serve to generate volatiles which then interact with copper-loaded surrogate ash to produce PCDD/F. The measurements indicate a preference for the formation of PCDF over PCDD in all experiments. Lignin yields considerably more PCDD/F than the carbohydrates, in agreement with the previous measurement in experiments performed under inert conditions [Tame, Dlugogorski, Kennedy, Conversion of Wood Pyrolysates to PCDD/F, Proc. Combust. Inst. 32, submitted]. The ratio of PCDD to PCDF varies according to the chemical structure of the feed; with carbohydrates demonstrating greater relative propensity for PCDF than lignin. The lignin monomers with methyl ether subsitituents (i.e., vanillin and syringol) produce less PCDD/F than those without (i.e., catechol and p-ydroxybenzaldehyde). Ensuing experiments, to examine yield of PCDD/F as a function of temperature and mass loading of vanillin, reveal the mechanism of heterogeneous condensation of chlorophenols with subsequent chlorination/dechlorination.
- Subject
- fire chemistry; pollutants from fires; toxicity; dioxins; fires of wood and biomass; treated wood; copper fungicide
- Identifier
- http://hdl.handle.net/1959.13/1036548
- Identifier
- uon:13308
- Identifier
- ISSN:1817-4299
- Language
- eng
- Full Text
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