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- W2040450491 abstract "Catalytic combustion over a 2 wt % Pt/γ-Al2O3 catalyst of chlorobenzene (PhCl) and of a micropollutant-like mixture representative for a primary combustion offgas has been investigated. Typical conditions were 1000−1500 ppm of organics in the inflow, contact times ∼0.3 s, 16% O2 in nitrogen at ∼1 bar, and temperature range 200−550 °C. PhCl reacts considerably slower than when processing Cl-free compounds such as heptane. At intermediate temperaturesand incomplete conversionbyproducts are formed, especially polychlorobenzenes (PhClx). These are accompanied by polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) at levels of about 10-6 relative to PhClx. Additional HClmade by co-reacting PhCl with tert-butylchlorideleads to much higher levels of PhClx and PCDD/Fs. Using the micropollutant-like mixture, the total chlorine input is reduced almost 20-fold, but it nevertheless leads to a 30-fold higher PCDD/F output. This is ascribed to reaction of the small amounts of (chloro)phenols in the mixture. The congener/isomer patterns of the PCDD/Fs for the mixture and with PhCl per se are quite comparable with those found in emissions from incinerators. As carbon is not present nor formed on the catalyst surface, de-novo formation therefrom cannot be involved. Rather condensation of phenolic entities or like precursors must have occurred. Consequences and options to ensure safe application are briefly discussed as well." @default.
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- W2040450491 date "2004-08-24" @default.
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- W2040450491 title "Formation of Dioxins in the Catalytic Combustion of Chlorobenzene and a Micropollutant-like Mixture on Pt/γ-Al<sub>2</sub>O<sub>3</sub>" @default.
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- W2040450491 doi "https://doi.org/10.1021/es034820y" @default.
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