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Kinetic Study of the Hydrodechlorination of Trichloroethene in Water Using a Platinum Catalyst and Hydrazine

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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.

Keywords: CATALYTIC HYDRODECHLORINATION; PSEUDOFIRST-ORDER RATE CONSTANT; TRICHLOROETHENE

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143003X141277

Publication date: September 1, 2003

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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