PCDD/PCDF Ratio in the Precursor Formation Model over CuO Surface | Zendy

Shadrack Nganai | Zendy; Barry Dellinger | Zendy; Slawo Lomnicki | Zendy

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PCDD/PCDF Ratio in the Precursor Formation Model over CuO Surface

Author(s) -

Shadrack Nganai,

Barry Dellinger,

Slawo Lomnicki

Publication year - 2014

Publication title -

environmental science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.851

H-Index - 397

eISSN - 1520-5851

pISSN - 0013-936X

DOI - 10.1021/es504253w

Subject(s) - dibenzofuran , chemistry , environmental chemistry , combustion , phenols , persistent organic pollutant , polychlorinated dibenzofurans , organic chemistry , hydrocarbon

The discrepancies between polychlorinated dibenzo-p-dioxin to polychlorinated dibenzofuran (PCDD to PCDF) ratios in laboratory and field studies in the exhaust of combustion sources are not fully explained by available formation models. In this paper we present the results of experimental studies of the surface mediated formation of PCDD/F at the conditions mimicking the combustion cool zone from a mixture of 1,2-dichlorobenzene (1,2-DCBz) and 2-monochlorophenol (2-MCP) over a model surface consisting of 5% CuO/Silica. The PCDD to PCDF ratio was found to be strongly dependent on the ratio of chlorinated benzenes to chlorinated phenols and oxygen content. The higher the 1,2-DCBz to 2-MCP ratio, the lower the PCDD to PCDF ratio. PCDFs are formed predominantly from chlorinated benzenes, while chlorinated phenols are responsible for majority of PCDDs. These laboratory results are in general agreement with full-scale measurement and can be used to improve predictive models of PCDD/F formation.

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