Abstract: The effects of SO₂, SO₃ on de novo synthesis of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) were studied using model fly ashes incorporating copper oxide and activated carbon. It was found that the inhibitive effect of SO₂ on PCDD/Fs formation is similar to that of SO₃. To investigate the inhibition mechanism, CuSO₄ formations from both CuO and CuCl₂ were examined. The ability of SO₃ to convert CuCl₂ and CuO on a silica support into sulfate is much stronger than that of SO₂. However, replacing silica by activated carbon leads to a much high conversion of CuCl₂ to CuSO₄ in the presence of SO₂. The promotion by activated carbon is explained by the reduction of CuCl₂ to Cu₂Cl₂ and the eventual conversion of Cu₂Cl₂ into CuSO₄ is the main inhibition mechanism of SO₂ on de novo synthesis of PCDD/Fs.

Key words: Cuprous chloride, Model fly ash, Sulfation, Cupric chloride

Please provide your name, email address and a comment

Your Name: Affili: E-Mail Address:

Comment (Please comment in English):


Verification Code(click to change a pic):