Efecto catalítico del agua en fase gaseosa. reacción entre el radical OH y COVs oxigenados

Congreso; XX Congreso Argentino de Fisicoquímica y Química Inorgánica. AAIFQ; 2017

Abstract: The rate coefficient for the reaction CH3OH+OH
was determined by means of arelative method in asimulation
chamber under quasi-real atmospheric conditions (294 K,
1atm of air) and variable humidity or water concentration.
Under these conditions,aquadratic dependence of the rate
coefficient for the reaction CH3OH+OH on the water
concentration was found. Thus the catalytic effect of water is
not only important at low temperatures, but also at room
temperature. The detailed mechanism responsible of the
reaction acceleration is still unknown. However, this dependence
should be included in the atmospheric global models since
it is expected to be important in humid regions as in the tropics.
Additionally, it could explain several differences regarding the
global and local atmospheric concentration of methanol in
tropical areas, for which many speculations about the sinks and
sources of methanol have been reported.