Journal article
Influence of transition metal additives and temperature on the rate of organohalide reduction by granular iron: Implications for reaction mechanisms
Applied catalysis. B, Environmental, Vol.76(3), pp.348-356
2007
DOI: 10.1016/j.apcatb.2007.06.003
Abstract
This study provides mechanistic insights into the reduction of organohalides by granular iron as well as the origin of the rate enhancements typically observed when transition metals are added to the surface of granular iron. Using step-wise displacement plating of CuCl
2, K
2PdCl
4 and K
2PtCl
4, different bimetallic and trimetallic reductants were prepared and characterized using a suite of analytical techniques that included energy filtered transmission electron microscopy (EFTEM). Results obtained from batch studies with the trimetals indicate that reactivity enhancements of 1,1,1-trichloroethane (1,1,1-TCA) reduction are controlled by the chemical identity of the transition metal additive at the liquid/solid interface. Temperature-dependent studies involving iron and bimetals revealed that rates of 1,1,1-TCA reduction increased exponentially with increasing temperature. A systematic shift in product distribution towards more fully hydrogenated products was also observed as the overall rate of 1,1,1-TCA reduction increased. Collectively, these results support recent studies, which suggest that atomic hydrogen is involved in the reduction of alkyl polyhalides by granular iron and bimetallic reductants.
Details
- Title: Subtitle
- Influence of transition metal additives and temperature on the rate of organohalide reduction by granular iron: Implications for reaction mechanisms
- Creators
- Stephen J Bransfield - Department of Chemistry, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USADavid M Cwiertny - Department of Geography and Environmental Engineering, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USAKenneth Livi - Department of Earth and Planetary Science, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USAD. Howard Fairbrother - Department of Chemistry, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
- Resource Type
- Journal article
- Publication Details
- Applied catalysis. B, Environmental, Vol.76(3), pp.348-356
- Publisher
- Elsevier B.V
- DOI
- 10.1016/j.apcatb.2007.06.003
- ISSN
- 0926-3373
- eISSN
- 1873-3883
- Language
- English
- Date published
- 2007
- Academic Unit
- Civil and Environmental Engineering; Chemical and Biochemical Engineering; Center for Health Effects of Environmental Contamination; Public Policy Center (Archive)
- Record Identifier
- 9983992071602771
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