KINETIC STUDIES ON THE REACTIONS OF OZONE WITH FORMIC ACID AND WITH PARTIALLY HALOGENATED HYDROCARBONS

RALPH JOHN STEINBERG, Fordham University

Abstract

The reactions of ozone with formic acid and with 1,1-difluoroethane were studied using an infrared method of analysis. The change in concentration of ozone and products was followed by observing the change in absorption. The products of the reaction of ozone with formic acid are carbon dioxide and presumably water; for 1,1-difluoroethane, carbon dioxide, carbon monoxide, carbonyl fluoride, acetyl fluoride, formic acid, acetic acid, water and silicon tetrafluoride.^ Rate constants were calculated on the basis of the equations^ -d{O(,3)}/dt = k{O(,3)}{CH(,3)CF(,2)H}^ -d{O(,3)}/dt = k{O(,3)}{(HCOOH)(,2)}/{HCOOH}('1/2)^ The activation energies for the reactions studied are 13.9 Kcal./mole for formic acid and 14.7 Kcal./mole for 1,1-difluoroethane in the absence of oxygen. The pre-exponential terms are 2.38 x 10('9) M('- 1/2) sec('-1) and 1.47 x 10('8) M('-1) sec('-1), respectively. In both reactions, a prior decomposition of ozone to yield atomic oxygen is proposed as a chain-initiating step.^ Mechanisms are presented for each reaction in order to explain the results. ^

Subject Area

Physical chemistry

Recommended Citation

STEINBERG, RALPH JOHN, "KINETIC STUDIES ON THE REACTIONS OF OZONE WITH FORMIC ACID AND WITH PARTIALLY HALOGENATED HYDROCARBONS" (1980). ETD Collection for Fordham University. AAI8020085.
http://fordham.bepress.com/dissertations/AAI8020085

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