About this Environmental Science article

Synergistic effect of mixed Cu and Fe oxides and chlorides on electrophilic chlorination of dibenzo-p-dioxin and dibenzofuran by Dan Wang; Haijun Zhang; Yun Fan; Rong Cao; Yuan Gao; Jiping Chen is a Environmental Science article available to read on EtoBox.

The direct chlorination of dibenzo-p-dioxin (DD) and dibenzofuran (DF) is an important source of dioxins in combustion flue gas. The chlorination reaction mainly occurs via electrophilic substitution induced by Cu and Fe chlorides, which must cohabit on particulate matters in mixed state. To explore the mechanism for DD/DF chlorination in real combustions flue gas, 8 kinds of CuO/FeO/CuCl/FeCl composites impregnated onto silica powder were prepared to simulate the coexisting state of Cu and Fe species in combustion flue gas. Mixed Cu and Fe oxides and chlorides induced a significant synergistic effect on electrophilic chlorination of DD/DF. The efficiencies of DD/DF chlorination over composites containing both Cu and Fe species were 1-2 orders of magnitude higher than those over composites containing only Fe species at 250 °C. CuCl species were highly active sites for electrophilic chlorination. FeCl acted as an excellent promoter to accelerate DD/DF chlorination over CuCl species. The elevated proportion of Cu and Fe oxides was also favora ble for electrophilic chlorination. Compared with DF, DD was more prone to be chlorinated. Chlorine substitution primarily occurred at 2, 3, 7

Author

Dan Wang; Haijun Zhang; Yun Fan; Rong Cao; Yuan Gao; Jiping Chen

Publisher

Elsevier Science; Elsevier ; Elsevier BV; Publons (ISSN 0048-9697)

Published

2020

Language

EN

Field

Environmental Science (Physical Sciences)