INVESTIGATION OF THE GRAPHITE-H2SO4-GASEOUS OXIDIZER (CL-2, O-3, SO3)SYSTEM

The intercalation of H2SO4 into graphite during chemical oxidiation by gaseous oxidizers (Cl-2, O-3, SO3) was investigated by X-ray and pote ntiometric methods. It is shown that stage 2 (oxidizer, Cl-2) and stag e 1 (oxidizer, O-3) are formed in 94% H2SO4. It was established that t he rate of the stage 2 GHS formation depends on the Cl-2 ultraviolet r adiation, high pressure Cl-2 (P = 40-70 atm) and temperature. As expec ted the rate of the stage 1 GHS formation (oxidizer, O-3) was increase d with content of O-3 in a O-3-O-2 gaseous mixture. The graphite-oleum system was investigated in a wide range of oleum concentrations (5-57 % of free SO3) by potentiometric and calorimetric methods. It was esta blished that the potentials of GIC formation with oleum are different from potentials of GHS formation when salt-like, Cl-2 or O-3 are used as oxidizers. In addition, the heat how curves have a monotonous behav iour. These factors were explained by the co-intercalation of SO3 with anions of sulphuric acid into graphite.