Batch reactor kinetic studies on the reductive dechlorination of chlorinated ethylenes by tetrakis-(4-sulfonatophenyl)porphyrin cobalt.
Tetrakis-(4-sulfonatophenyl)porphyrin cobalt was identified as a highly-active reductive dechlorination catalyst for chlorinated ethylenes. Through batch reactor kinetic studies, degradation of chlorinated ethylenes proceeded in a step-wise fashion with the sequential replacement of Cl by H. For perchloroethylene (PCE) and trichloroethylene (TCE), the dechlorination products were quantified and the C₂ mass was accounted for. Degradation of the chlorinated ethylenes was found to be first-order in substrate. Dechlorination trials with increasing catalyst concentration showed a linearly increasing pseudo first-order rate constant which yielded rate laws for PCE and TCE degradation that are first-order in catalyst. The dechlorination activity of this catalyst was compared to that of another water-soluble cobalt porphyrin under the same reaction conditions and found to be comparable for PCE and TCE.
Department of Chemistry, Pepperdine University, Malibu, CA 90263, United States.
Brandon R
BR
Barnett
Alexandra L
AL
Evans
Courtney C
CC
Roberts
Joseph M
JM
Fritsch
D002384:Catalysis; D005030:Ethylenes / Q000737:chemistry*; D054879:Halogenation; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008665:Metalloporphyrins / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D005030:Ethylenes; D008665:Metalloporphyrins; D014874:Water Pollutants, Chemical; C056134:cobalt(III)-tetrakis(4-sulfonatophenyl)porphyrin