Features of Propene Oxidation in Argon, Carbon Dioxide and Water Vapor Media at a High Density of Reagents

Abstract

The features of propene oxidation in high-density mixtures of C3H6/O2 ([C3H6]0 = 0.23–0.25 mol/dm3, [O2]0 = 0.76–0.82 mol/dm3), diluted with argon, carbon dioxide and water vapor at uniform heating (1 K/min) to T ≤ 620 K are investigated for the first time. From the time dependences of reaction mixtures temperature it is found that propene self-ignition occurs at 465 K and does not depend on the nature of the diluent. Using mass spectrometry analysis it is demonstrated that in the composition of the products of propene oxidation in the Ar and CO2 medium predominate methanol, acetaldehyde, acetone, acetic acid and formaldehyde; in the oxidation in the H2O medium, only small amof O2 in the oxidation of propene increases in ounts of these substances were registered. Degree of consumption the following order: CO2 ≪ Ar < H2O, which is a consequence of the involvement of CO2 and H2O molecules in chemical transformations. Mechanisms of the observed processes are discussed.