STUDY ON THE AUTOXIDATION REACTIONS OF ENDOTHERMIC HYDROCARBON FUELS

The hydroperoxide contents in two kinds of endothermic hydrocarbon fuels,ZH-100 and JP-10,during the auto-oxidation at different temperatures from 100 to 180℃ were determined by an accelerated oxidation test.The changes of hydroperoxide content with the autoxidation temperature and time were investigated,and the effects of copper on the autoxidation of the fuels at 100,120 and 140 ℃ were also studied.The hydroperoxide measurements indicated that the temperature showed strong effects upon the autoxidation of the fuels and the formation of hydroperoxides.The higher the temperature,the faster the reaction rate of autoxidation,the earlier the maximum value of hydroperoxide content occurred,and the less the value of hydroperoxide content.It is found that the copper played catalytic roles in the autoxidation and deposit formation in the fuels.From FT-IR spectra of oxidized fuels and their deposits,the characteristic peaks of the functional groups of —OH,C—O,and C=O were obviously observed.It can be confirmed that carbonyl compounds were the main components in the deposits.The experimental phenomena can be successfully explained by the radical chain mechanism for the auto-oxidation of endothermic hydrocarbon fuels,which presented the important fundamentals for investigating thermal-oxidation stability,and developing endothermic hydrocarbon fuels.