Temperature dependence of the rate constant for the bimolecular recombination of Cl-2 in water—A pulse radiolysis study
Abstract
The rate constant for the disproportionation of Cl-2 in water has been determined for the temperature range 22-87 °C using pulse radiolysis of 0.1 M NaCl+1 mM HClO4 aqueous solution. The rate constant for the decay of Cl-2 has been found to be 2×(7.35±0.53)×108 M-1 s-1 at 22 °C (at zero ionic strength). The determined activation energy, Ea=10.89±0.37 kJ mol-1, is less than expected for diffusion-controlled reactions. A good fit to the Noyes equation (1/kobs=1/kdiff+1/kreact) has been obtained assuming the reaction step is activationless with kreact=A‧T.
- Publication:
-
Radiation Physics and Chemistry
- Pub Date:
- April 2014
- DOI:
- 10.1016/j.radphyschem.2013.11.037
- Bibcode:
- 2014RaPC...97..184S