Manganese sulfate effect on PAH formation from polystyrene pyrolysis
| Autor: | Yu-Ling Wei, Jen-Ho Lee |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
chemistry.chemical_classification
Environmental Engineering Inorganic chemistry chemistry.chemical_element Manganese Combustion medicine.disease_cause complex mixtures Pollution Soot chemistry.chemical_compound Hydrocarbon chemistry medicine Environmental Chemistry Polystyrene Char Waste Management and Disposal Pyrolysis Dichloromethane |
| Zdroj: | Science of The Total Environment. 228:59-66 |
| ISSN: | 0048-9697 |
| Popis: | Polystyrene (PS) was pyrolyzed with/without manganese sulfate addition in a 100% N 2 environment at 600, 700 and 800°C in a laboratory quartz reactor. The mole ratio of carbon (in PS) to Mn was 40/1. The gas-phase and liquid-phase polycyclic aromatic hydrocarbons (PAHs) were extracted with dichloromethane (DCM) and subsequently prepared for further analysis with an HPLC equipped with a wavelength-scanning ultraviolet (UV) detector and a fluorescence (FL) detector. Virtually no char or coke residue was observed in the reactor at the end of the pyrolysis reaction. The addition of MnSO 4 into the high-temperature pyrolysis of PS reduced PAH formation in all liquid and gas products. The transition metal-chelating oxidation mechanism previously used to explain soot reduction during combustion was not adequate for explaining the results of PAH reduction via MnSO 4 addition into the inert pyrolysis. Furthermore, it is suggested that soot reduction via manganese salt addition into oxygen-rich combustion might not result only from the well-accepted chelating oxidation mechanism; rather, it might result from the reduction of hydrocarbon species in the locally fuel-rich environment via manganese salt addition, as inferred from the reduction of PAH formation during inert pyrolysis with/without MnSO 4 addition observed in this study. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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