Autocatalysis in oxidation of diesel fuel sulfides by hydrogen peroxide in the presence of molybdenum(VI) oxide

Kinetics of Petroleum Sulfides Peroxidation in the Presence of Two Catalysts

“…When using MoO 3 and H 2 MoO 4 catalysts, various kinetics could be observed in the reaction of petroleum sulfides peroxidation, although in both cases the oxidizer is peroxymolybdenum acid [1][2][3]. Although catalytic behavior of molybdic and wolframic acids in the reaction of petroleum sulfides peroxidation is the same, oxidizers in these systems are different peroxo-compounds (H 2 MoO 5 and H 2 WO 5 ).…”

“…where, V -volume 0,05 mole/dm 3 (0,05n) of chloric acid solution in dioxane, used for titration, cm 3 ; N -molarity of chloric acid solution in dioxane; P-sample weighted quantity, g; 32-sulfur atomic weight.…”

“…By the slope ratio of these transformations were calculated the values of effective constants of the rate (1) k MD (table 1). Constance of (1) k MD while varying of catalysts mixture compound (table 1), equation 5)shows that in the developed oxidation in all tests there is the same balanced concentration of peroxymolybdenum acid, which represents the sum of [ (1) (table 2) Calculation of the effective constant of the rate of sulfoxides accumulation (@0AG) k MD using the equation (22) and taking into account mole fraction and values (3) k MD and (4) k MD of catalysts showed that testing and calculated values of the effective constant of the rate are practically the same, within the permitted experimental error (table 2). This means that when using combined catalytic system H 2 MoO 4 + H 2 WO 4 in the reaction of sulfides peroxidation two catalytic cycles are realized parallel and independently from each other.…”

“…In the research works [1][2][3][4][5][6][7][8][9] we showed that kinetics and products of petroleum sulfides peroxidation to sulfoxides depends on the reactivity and mechanism of molybdic compounds catalytic effect. The present work is the continuation of this research and is devoted to the study of kinetics of petroleum sulfides peroxidation under the influence of hydrogen peroxide and mixtures of two catalysts «molybdic acid + molybdenum oxide (VI)» and «molybdic acid + wolframic acid».…”