Catalytic hydrodechlorination of chlorinated ethenes by nanoscale zero-valent iron

The reduction of six chlorinated ethenes by nanoscale iron (dichloroethenes (DCEs)>trichloroethene (TCE)>tetrachloroethene (PCE)). This trend suggests the reduction of chlorinated ethenes by nanoscale iron did not occur under thermodynamic control (e.g. reduction potential), rather, it proceed...

Full description

Saved in:
Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2008-01, Vol.78 (1-2), p.53-60
Main Authors: Song, Hocheol, Carraway, Elizabeth R.
Format: Article
Language:English
Subjects:
Boron
Catalysis
Catalytic hydrogenation
Chlorinated compounds
Chlorination
ethane
Hydrogen
Iron
Nanoscale iron
Q1
Reductive dechlorination
Salts
Tetrachloroethylene
Thermodynamics
Vinyl chloride
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The reduction of six chlorinated ethenes by nanoscale iron (dichloroethenes (DCEs)>trichloroethene (TCE)>tetrachloroethene (PCE)). This trend suggests the reduction of chlorinated ethenes by nanoscale iron did not occur under thermodynamic control (e.g. reduction potential), rather, it proceeded via a catalytic pathway involving reactive hydrogen species. The reduction of TCE under five different conditions of initial dissolved hydrogen concentrations which varied from about 0.02 to 1.2mM confirmed the importance of hydrogen in the reaction pathway and revealed an excellent linear correlation between rate constant and hydrogen concentration. Reduction of a chlorinated ethane (1,1,1,2-tetrachloroethane) which produced 1,1-DCE as an intermediate, showed no dependence on hydrogen concentrations but the disappearance of the ethene intermediate did. TCE reduction by commercial grade micro-sized iron samples, in contrast, showed insignificant dependence on hydrogen concentration, suggesting the nanoscale iron synthesized by borohydride reduction of iron salts is particularly suited for hydrogen utilization through a catalytic reduction of chlorinated ethenes.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2007.07.034