Journal article
Conversion of wood pyrolysates to PCDD/F
Proceedings of the Combustion Institute, Vol.32(1), pp.665-671
2009
Abstract
This contribution assesses the propensity of wood components to form polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/F) in fires and in combustion in stoves, heaters and burn barrels. Volatiles generated from model lignocellulosic compounds or fractions isolated from wood are reacted with a surrogate ash positioned in a tubular reactor under inert pyrolysis atmospheres. The surrogate ash contains copper and chlorine salts to simulate heterogeneous PCDD/F formation during combustion of preservative-treated wood. Pyrolysis temperatures were selected to fall within the range in which the component decomposes, while the surrogate ash temperature was set at 400°C which is typical of pyrolysis during fires, and corresponds to conditions which were favourable to PCDD/F formation. PCDF are favoured over PCDD in all experiments. Lignin yields considerably more PCDD/F than the carbohydrates. The ratio of PCDD to PCDF varies according to the chemical structure of the feed; with carbohydrates demonstrating greater relative preference for PCDD than lignin. PCDD/F formation via direct chlorination of dibenzofuran and dibenzo-p-dioxin dominates the pyrolysis of lignin, as evidenced by a significant preference for 2,3,7,8 congeners. Carbohydrates likely produce PCDD/F as a result of formation and condensation of chlorophenol.
Details
- Title
- Conversion of wood pyrolysates to PCDD/F
- Authors/Creators
- N.W. Tame (Author/Creator) - University of Newcastle AustraliaB.Z. Dlugogorski (Author/Creator) - University of Newcastle AustraliaE.M. Kennedy (Author/Creator) - University of Newcastle Australia
- Publication Details
- Proceedings of the Combustion Institute, Vol.32(1), pp.665-671
- Publisher
- Elsevier Limited
- Identifiers
- 991005540900107891
- Copyright
- © 2009 The Combustion Institute.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
- Note
- 32nd International Symposium on Combustion; Montreal, QC; Canada; 3 - 8 August 2008
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