Reductive dechlorination of tetrachloroethylene (PCE) catalyzed by cyanocobalamin |
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Authors: | Habeck Brian D Sublette Kerry L |
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Institution: | 1.Center for Environmental Research & Technology, University of Tulsa, 600 S. College Ave., 74104, Tulsa, OK ; |
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Abstract: | A biomimetic system has been developed for the reductive dechlorination of tetrachloroethylene (PCE). PCE was dechlorinated
to trichloroethylene (TCE) and 1,2-dichloroethylene (DCE) in the presence of dithiothreitol or Ti (III) citrate and catalytic
amounts of cyanocobalamin in both homogeneous reaction mixtures and packed bed reactor systems. In packed bed reactors with
Ti (III) citrate as the reductant, PCE (0.18 mM) conversion averaged 55% at residence times of 1.75 and 3.5 h. The product distribution was 94% TCE and 6% DCE at the lower
residence time. DCE formation increased to 45% at the higher residence time. No reduction of PCE was observed in the absence
of cyanocobalamin. This system may be useful as a means of pretreatment of halogenated aliphatic hydrocarbons in advance of
biological treatment. |
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Keywords: | Index Entries" target="_blank">Index Entries Tetrachloroethylene (PCE) cyanocobalamin vitamin B12 trichloroethylene (TCE) dichloroethylene (DCE) |
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