离子液体中过氧钼酸盐催化燃油深度氧化脱硫

Deep oxidative desulfurization of fuels using peroxomolybdate as a catalyst in ionic liquids

以过氧化氢为氧化剂,[Omim]PF6离子液体为萃取剂,[C16mim]2 Mo2O11为催化剂建立了萃取催化氧化脱硫体系(ECODS)。该反应体系在非常温和的条件下可使DBT的脱除率最高达到99.4%,大大优于单纯的萃取脱硫和萃取氧化脱硫体系。不同硫化物在该体系下的脱硫效果为:DBT>BT>TH。催化体系循环使用10次后催化反应活性未见明显下降。将此催化体系直接用于市售的汽油和柴油,可使其中硫含量降低至12.70mg/L和11.62mg/L。

The oxidation of aromatic sulfur compounds（dibenzothiophene [DBT],benzothiophene [BT] and thiophene [TH]） was studied at 30 ℃ and in an extraction and catalytic oxidation desulfurization（ECODS） system composed of model oil,hydrogen peroxide,1-octyl-3-methylimidazolium hexafluorophosphate（[Omim]PF6） and a peroxomolybdate catalyst [C16mim]2 Mo2O11（C16mim = 1-hexadecy-3-methylimidazolium）. In this system,the removal rate of DBT could reach as high as 99.4% under mild conditions,which was superior to that of the simple chemical oxidation or extraction combined chemical oxidation. The catalytic oxidation reactivity of the different substrates decreased in the order：DBTBTTH. The catalytic system could be recycled ten times without a significant decrease in catalytic activity. The system was also applied to commercial gasoline and diesel oil,and the resulting sulfur content decreased to 12.7mg/L and 11.6mg/L,respectively.