Kinetic Study of the Hydrodechlorination of Trichloroethene in Water Using a Platinum Catalyst and Hydrazine
Abstract:Column experiments were used to measure the hydrodechlorination rate of relatively high concentrations of trichloroethene (TCE) (approximately 100 mg L−1). Trichloroethene in water was treated with a platinum on titania (Pt–TiO2) catalyst and hydrazine. The influence of some experimental conditions (i.e., flowrate, temperature, and pH) on the catalytic conversion of TCE was studied. The pseudo-first-order rate constant of the overall hydrodechlorination of TCE was approximately 1 × 10−3 to 1 × 10−2 s−1 in the temperature range of 283 to 328 K and was determined from the dependence of the TCE conversion on the contact time of the feed water with the catalyst by assuming first-order kinetics. The activation energy of the catalytic hydrodechlorination of TCE was calculated as approximately 34 kJ/mol from the temperature dependence of the rate constant. The TCE conversion increases with increasing pH, and probably correlates with the presence of un-ionized hydrazine.
Document Type: Research Article
Publication date: September 1, 2003
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