Oxygen absorption by 2,5-dimethylpyrrole doped shale diesel fuel: Measurement under conditions of accelerated storage

The absorption of oxygen by thermally stressed samples of a shale-derived diesel fuel containing an active dopant was conveniently monitored by means of a gas buret assembly. The depletion of soluble 2,5-dimethylpyrrole in the fuel was correlated with oxygen uptake in doped fuel samples at temperatures of 65 and 80 °C. The observation of induction periods in DMP-promoted fuel instability were noted. The auto-oxidation of DMP in the fuel was confirmed to be first order in DMP with an approximate activation energy of 11–12 kcal mol −1, in agreement with earlier gravimetric studies.