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Formation of PCDD/Fs in oxidation of 2-chlorophenol on neat silica surface

Mosallanejad, S., Dlugogorski, B.Z., Kennedy, E.M., Stockenhuber, M., Lomnicki, S.M., Assaf, N.W. and Altarawneh, M.ORCID: 0000-0002-2832-3886 (2016) Formation of PCDD/Fs in oxidation of 2-chlorophenol on neat silica surface. Environmental Science & Technology, 50 (3). pp. 1412-1418.

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This contribution studies partial oxidation of 2-chlorophenol on surfaces of neat silica at temperatures of 250, 350, and 400 °C; i.e., temperatures that frequently lead to catalytic formation of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) from their precursors. We have identified 2,6-dichlorophenol (2,6-DCPh), 2,4-dichlorophenol (2,4-DCPh), and 2,4,6-trichlorophenol (2,4,6-TriCPh), but have detected no chlorinated benzenes (CBzs). The detected chlorinated and nonchlorinated DD/Fs comprise dibenzo-p-dioxin (DD), 1- and 2-monochlorodibenzo-p-dioxin (1-, 2-MCDD), 1,6-, 1,9-, 1,3-dichlorodibenzo-p-dioxin (1,6-, 1,9-, 1,3-DCDD), 4-monochlorodibenzofuran (4-MCDF), and 4,6-dichlorodibenzofuran (4,6-DCDF) at the reaction temperatures of 350 and 400 °C. However, at a lower reaction temperature, 250 °C, we have detected no PCDD/Fs. We have demonstrated that neat silica surfaces catalyze the generation of PCDD/Fs from chlorophenols at the upper range of the catalytic formation temperature of PCDD/F. The present finding proves the generation of PCDD/Fs on particles of fly ash, even in the absence of transition metals.

Item Type: Journal Article
Murdoch Affiliation(s): School of Engineering and Information Technology
Publisher: American Chemical Society
Copyright: © 2015 American Chemical Society.
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