A Preliminary Study of Ester Oxidation on an Aluminum Surface Using Chemiluminescence

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Abstract
The oxidation characteristics of a pure ester (trimethyolpropane triheptanoate) were studied by using a chemiluminescence technique, Test were run in a thin-film microoxidation apparatus with an aluminum alloy catalyst. Condition included a pure oxygen atmosphere and a temperature range of 176 to 206°C. Results indicated that oxidation of the ester (containing 10−3 M diphenylanthracene as an intensifier) was accompanied by emission of light. The maximum intensity of light emission (Imax) was a function of the amount of ester, the concentration of intensifier, and the test temperature. The induction period or the time to reach one-half of maximum intensity (t½) was an inverse function of test temperature. Decreases in light emission at the later stages of a test were caused by depletion of the intensifier.

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