Oxidation of Propylene by Photolysis in the Presence of NO2

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Abstract
Mixtures of propylene and NO2 were photolyzed at 3660 Å, and quantum yields of NO2 consumption were determined as a function of propylene pressure, NO2 pressure, total pressure (using N2), and temperature. The quantum yields increased as a function of (C3H6) and approached a value of about 6. The rates of production of the principal products of the reaction were measured, and a mechanism is presented to explain the quantum yield behavior and the products found. The essential features of the mechanism are that O atoms produced by the photolysis of NO2 add to propylene, producing intermediates that are either stabilized by collisions or dissociate into free radicals. Nitrogen dioxide reacts rapidly with the free radicals producing stable products.

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