Catalytic effects by metal oxides on the formation and degradation of chlorinated aromatic compounds in fly ash

Öberg, Tomas; Bergbäck, Bo; Filipsson, Monika

doi:10.1016/j.chemosphere.2007.10.033

Cited by 37 publications

(23 citation statements)

References 26 publications

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“…The concentration of CBzs in the SP ash was up to 950 ng kg -1 which was similar with that of BG1 ash. As reported, the concentration of CBzs in the MSWI ash is 280 ng g -1 (Oberg et al, 2008). The concentration was 2.5 ng g -1 for coal ash and 1625-13900 ng g -1 for MSWI fly ash (National Bureau of Statistics of China, 2014).…”

Section: Solid Samplesmentioning

confidence: 92%

Formation, Reduction and Emission Behaviors of CBzs and PCDD/Fs from Cement Plants

Zhan

Chen

et al. 2016

Aerosol Air Qual. Res.

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The formation, reduction and emission behaviours of chlorobenzenes (CBzs) and polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) were studied in a typical dry cement kiln in China. The operating conditions were scrutinized at various positions by monitoring the concentrations of CO, NO x , HF and HCl in the flue gas. Furthermore, the concentration, gas/particle partition and congener distribution of CBzs and PCDD/Fs were analyzed at the outlet of cyclone pre-heater, suspension pre-heater, raw mill and stack. The main PCDD/F formation zone was proven to be the first stage of pre-heater and the congener distribution of PCDD/Fs was significantly affected by the recycling ash. Specially, the concentration of CBzs continually increased with the flowing of flue gas. The final emissions of PCDD/Fs and CBzs in the flue gas were 0.016 ng I-TEQ Nm -3 and 26 µg Nm -3 , respectively. Moreover, the reduction efficiency of I-TEQ via bag filter was up to 81% and 86% for gas and particle phase PCDD/Fs, respectively. Most importantly, the mass balances indicated that raw meal was the dominant input and the rotary kiln incinerating waste was clearly a weighed PCDD/F and CBz sink. Furthermore, HCBzs correlated well with the total I-TEQ during the whole process of cement production.

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Section: Solid Samplesmentioning

confidence: 92%

Formation, Reduction and Emission Behaviors of CBzs and PCDD/Fs from Cement Plants

Zhan

Chen

et al. 2016

Aerosol Air Qual. Res.

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“…PCDEs were formed from the precursor condensation on the simulated fly ash surface, including SiO 2 , SiO 2 /FeCl 3 , and SiO 2 /CuCl 2 surfaces. However, fly ash is an extremely complex material, and there are not only metal chlorides but also metal oxides in municipal solid waste (Chin et al 2012;Öberg et al 2008;Fujimori et al 2009;Altarawneh et al 2009;Weber et al 2002a, b, Lomnicki andDellinger 2003a). Nevertheless, the less pronounced effects of the metal oxides on the PCDEs formation were reported.…”

Section: Introductionmentioning

confidence: 99%

Influence of iron and copper oxides on polychlorinated diphenyl ether formation in heterogeneous reactions

Liu

Shen

Zhang

et al. 2013

Environ Sci Pollut Res

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Polychlorinated diphenyl ether (PCDE) has attracted great attention recently as an important type of environmental pollutant. The influence of iron and copper oxides on formation of PCDEs was investigated using laboratory-scale flow reactors under air and under nitrogen at 350°C, a temperature corresponding to the post-combustion zone of a municipal solid waste incinerator. The results show that the 2,2′,3,4,4′,5,5′,6-otachlorodiphenyl ether (OCDE) formed from the condensation of pentachlorophenol (PCP) and 1,2,4,5-tetrachlorobenzene (Cl 4

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“…10% of the Cl form was organic Cl at 400 C. Part of the zinc chloride was possibly oxidized, as with ferric chloride. Although [Zn] 10,17 indicating that zinc was a factor in dioxins formation in real fly ash.…”

Section: Comparison Of Influences Among Heavy Metal Chloridesmentioning

confidence: 99%

Chlorination Mechanism of Carbon during Dioxin Formation Using Cl-K Near-edge X-ray-absorption Fine Structure

et al. 2010

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Many environmental organic chemicals have chloride in their structure. Thus, researching the chlorination mechanism of carbon is of interest. Dioxins are typically concentrated in fly ash collected from the post-combustion zone during the operation of municipal solid waste incinerators. In this study, we report the application of Cl-K near-edge X-rayabsorption fine structure (NEXAFS) in determining the chlorination mechanism of carbon in fly ash. The separation of a chloride-carbon (C-Cl) bond was readily recognizable as a peak in the Cl-K NEXAFS spectrum. Chlorination effects could be estimated using Cl K-edge NEXAFS with no dependence on metal species. Analysis of Cl K-edge NEXAFS spectra showed the reduction of copper(II) chloride at 300 C and oxidation of iron(III) chloride at 400 C in connection with the chlorination of carbon.

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Catalytic effects by metal oxides on the formation and degradation of chlorinated aromatic compounds in fly ash

Cited by 37 publications

References 26 publications

Formation, Reduction and Emission Behaviors of CBzs and PCDD/Fs from Cement Plants

Formation, Reduction and Emission Behaviors of CBzs and PCDD/Fs from Cement Plants

Influence of iron and copper oxides on polychlorinated diphenyl ether formation in heterogeneous reactions

Chlorination Mechanism of Carbon during Dioxin Formation Using Cl-K Near-edge X-ray-absorption Fine Structure

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