Catalytic properties of nanostructured graphene in liquid-phase oxidation of naphthene-paraffin hydrocarbons of petroleum mineral oils

The paper deals with the liquid-phase aerobic oxidation of naphthene-paraffinic hydrocarbons separated from the distillate of transformer oil T-1500, a mixture of Azerbaijani oils.Reduced graphene oxide was used as a reaction catalyst.The distillate was purified from aromatic hydrocarbons by sulfonation before the oxidation process.The number of aromatic hydrocarbons in the fraction was ~1% after sulfonation.By spectral analysis methods, the physicochemical properties of the fractions before and after the sulfonation process were determined, and their structural and group composition were studied.The graphene used in the oxidation process as a catalyst was obtained by the wellknown Hammer method from a sample of graphene oxide, which was synthesized by oxidation of powdered natural graphite.The phase composition and microstructure of a graphene sample were determined by X-ray diffraction on an X-Ray TD-3500 diffractometer (China), using CuKα radiation.The thermal property (TG/DTG) of a graphene sample was studied in a synchronous thermal analyzer STA-449 ("JupiterF3", Germany), at a temperature range of 22.5-950°C and it was determined that the catalyst is thermally stable at temperatures of oxidation process.A high yield of synthetic petroleum acids was observed in the presence of reduced graphene oxide used as a catalyst for the liquid-phase aerobic process of oxidation of naphthene-paraffinic hydrocarbons separated from T-1500 oil distillate of a mixture of Azerbaijani oils.To study the dependence of the oxidation process on time, samples were taken every hour and IR spectra of the samples were recorded on ALPHA Fourier spectrometer from BRUKER (Germany) in the wave frequency range 600-4000 cm -1 .The progress the oxidation process of T-1500 was monitored by the appearance of a carbonyl group in the spectrum and an increase in its optical density with increasing reaction time.It was determined that experimental results coincide with the results obtained from the IR spectra of the samples Keywords: petroleum hydrocarbons, aerobic oxidation, heterogeneous catalysts, graphene, petroleum acids Introduction Oxidation of hydrocarbons with atmospheric oxygen is the simplest method for producing