Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/916559

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Title
Conversion of wood pyrolysates to PCDD/F
Author/Creator
Tame, N. W.;  Dlugogorski, B. Z.;  Kennedy, E. M.
Institution
The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
Description
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.
Relation
Proceedings of the Combustion Institute Vol. 32, Issue 1, p. 665-671
Publisher Link
http://dx.doi.org/10.1016/j.proci.2008.07.022
Date
2009
Publisher
Elsevier
Keyword(s)
impregnated wood;  copper pesticides;  copper preservatives;  catalytic pyrolysis of wood
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/916559
Identifier
ISSN:1540-7489
Reviewed
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Subject
"Proceedings of the Combustion Institute"
 
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