Effects of SO_2 and SO_3 on the formation of polychlorinated dibenzo-p-dioxins and dibenzofurans by de novo synthesis  

作　　者：Ke SHAO Jian-hua YAN Xiao-dong LI Sheng-yong LU Mu-xing FU Ying-lei WEI 

机构地区：[1]State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2010年第5期363-369,共7页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project supported by the National High-Tech Research and Devel-opment Program (863) of China (Nos. 2007AA061302 and 2007AA06Z336);the National Nature Science Foundation of China (No. 50576082);the Important Project on Science and Technology of Zhejiang Province of China (No. 2007C13084);the Zhejiang Provincial Natural Science Foundation of China (No. R107532);the Project on Science and Technology of Zhejiang Province of China (No. 2008C23090)

摘　　要：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.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.

关 键 词：Cuprous chloride Model fly ash SULFATION Cupric chloride 

分 类 号：X506[环境科学与工程—环境工程]