The reaction Cl + H2CO yields HCl + HCO: Decreased senstivity of stratospheric ozone to chlorine perturbations

Details The reaction Cl + H2CO yields HCl + HCO: Decreased senstivity of stratospheric ozone to chlorine perturbations The reaction Cl + H2CO yields HCl + HCO: Decreased senstivity of stratospheric ozone to chlorine perturbations

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..829s&link_type=abstract

Geophysical Research Letters, vol. 5, Oct. 1978, p. 829-831.

Physics

5

Atmospheric Chemistry, Hydrochloric Acid, Ozone Depletion, Reaction Kinetics, Stratosphere, Air Pollution, Atmospheric Composition, Formaldehyde

Scientific paper

The absolute rate constant for the reaction Cl + H2CO yields HCl + HCO has been determined by the flash-photolysis-resonance fluorescence method to be + or - 0.9 (2 sigma) x 10 to the -11th power cu cm/molecule per sec at 298 K and to have a negligible temperature dependence. This rate, which at stratospheric temperatures is more than 2000 times faster than the rate of Cl + CH4 and more than a factor of 2 faster than Cl + HO2, indicates that formaldehyde (H2CO) will compete significantly with methane (CH4) and HO2 for the conversion of active chlorine in the stratosphere to the inactive reservoir HCl. Chlorine will thus be a less efficient destroyer of stratospheric ozone than previously believed. One-dimensional eddy-diffusion photochemical model calculations indicate that the eventual ozone depletion for a steady-state chlorfluoromethane release at 1975 rates (750,000 tons/year) will be lowered from 20% to 18.5% by the inclusion of this reaction.

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