Rate constant and activation energy measurement for the reaction of atomic hydrogen with methanol, iodomethane, iodoethane, and 1-iodopropane in aqueous solution

Journal Article · Thu Oct 13 04:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100092a031· OSTI ID:6776489

Mezyk, S P ^[1]; Bartels, D M ^[2]

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1. Whiteshell Lab., Pinawa, Manitoba (Canada)
2. Argonne National Lab., IL (United States)

The Arrhenius parameters for the reaction of hydrogen atoms with methanol in aqueous solution have been determined by use of pulse radiolysis and electron paramagnetic resonance free induction decay attenuation measurements. At 25.5[degrees]C, an absolute scavenging rate constant of (2.84 [+-] 0.07) [times] 10[sup 6] dm[sup 3] mol[sup [minus]1] s[sup [minus]1] has been measured and over the temperature range 10.2-86.4[degrees]C, an activation energy of 29.4 [+-] 0.8 kJ mol[sup [minus]1] has been determined. These values have been used to make minor corrections to rate constant and activation energy values for the reaction of aqueous hydrogen atoms with indomethane, iodoethane, and 1-iodopropane. For these three compounds at 24.3[degree]C, rate constants of (1.17 [+-] 0.07) [times] 10[sup 10], (1.39 [+-] 0.05) [times] 10[sup 10], and (1.42 [+-] 0.06) [times] 10[sup 10] dm[sup 3] mol[sup [minus]1] s[sup [minus]1] and corresponding activation energies of 10.4 [+-] 0.4, 11.8 [+-] 0.4, and 11.9 [+-] 0.4 kJ mol[sup [minus]1] have been respectively calculated over the temperature range 9-52[degrees]C. 44 refs., 5 figs., 1 tab.

• OSTI ID: 6776489
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:41; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

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ACCIDENTS
ACTIVATION ENERGY
ALCOHOLS
AQUEOUS SOLUTIONS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DECOMPOSITION
DISPERSIONS
ELECTRON SPIN RESONANCE
ELEMENTS
ENERGY
HYDROGEN
HYDROXY COMPOUNDS
KINETICS
MAGNETIC RESONANCE
MATERIALS
METHANOL
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
RADIATION EFFECTS
RADICALS
RADIOACTIVE MATERIALS
RADIOLYSIS
REACTION KINETICS
REACTOR ACCIDENTS
RESONANCE
SCAVENGING
SOLUTIONS