The possibility of using of the catalytic system based on formic acid and a transition metal salt in the presence of hydrogen peroxide for desulfurization of nonhydrotreated vacuum gas oil has been explored. Conditions for effective oxidation of organic sulfur compounds and maximal extraction of oxidized compounds from the feedstock have been selected. It has been shown that the catalysts based on tungsten salts are the most effective those for oxidative desulfurization of heavy feedstock. Under optimum conditions, the degree of desulfurization of vacuum gas oil was 89%.

The possibility that a process comprising the oxidation of sulfur compounds present in gas condensate and its subsequent rectification can be used to desulfurize light petroleum fractions has been explored. Oxidation of gas condensate with hydrogen peroxide in the presence of transition metal salts followed by its rectification makes it possible to decrease the sulfur content in the gasoline and diesel fractions by 95 and 75%, respectively in the fraction, with the sulfur content of -the residual fraction (350°C–FBP) remaining almost unchanged.

The oxidative desulfurization of shale oil obtained by thermal extraction of organic matter from shale rock using an oxidative catalytic system composed of hydrogen peroxide, a molybdenum salt, and acids of different natures has been studied. It has been shown that the application of this method in combination with extraction of the oxidation products of organic sulfur compounds makes it possible to remove up to 94% of total sulfur from the synthetic oil.