过氧钼酸离子液体合成及催化性能

Synthesis and Catalytic Properities of Molybdenum Acid Peroxide Ionic Liquid

摘要:

以N-甲基咪唑、氯代正辛烷、钼酸钠和过氧化氢为原料合成了3-辛基-1-甲基咪唑过氧化钼酸盐离子液体[C8MIM]2[MO2O11]，通过核磁氢谱、核磁碳谱、红外、元素分析对产物的结构进行表征。考察了该功能化离子液体对二苯并噻吩的催化氧化性能，通过单因素分析确定了萃取耦合催化氧化脱硫的最佳实验条件：萃取剂与模拟汽油的体积比1:5，氧硫摩尔比6:1、催化剂用量5g/L模拟汽油、40oC下反应30min。在最佳实验条件下能使起始硫含量为500μg/mL二苯并噻吩/异辛烷模拟汽油降低到10μg/mL以下，脱硫率高达98.83%。考察了该体系循环使用性能，经过16次重复使用，脱硫率仍在98.4%左右。

Abstract:

3-octyl-1-methyimidazole molybdenum acid peroxide ionic liquid [C8MIM]2[MO2O11] was synthesized with N-methylimidazole, n-octyl chloride, sodium molybdate and hydrogen peroxide as raw materials, and the product was characterized by 1H, 13C, FTIR and elemental analysis. The catalytic oxidation properties of the functionalized ionic liquid for dibenzothiophene were examined. The optimum experiment conditions (the volume of the model gas oil was 5 times of extraction agent, the mole ratio of oxygen to sulfur was 6:1, the dosage of catalyst was 5g per liter of model gas oil, the reaction temperature was 40 oC and reaction time was 30 min) of extraction coupled catalytic oxidation desulfurization were determined through the single factor analysis. The initial sulfur content (500 μg/mL) of the dibenzothiophene/ isooctane model gas oil dropped below 10 μg/mL, and the desulfurization rate was as high as 98.83% at the optimum condition. The system recycling performance was further investigated and the result showed the desulfurization rate was about 98.4% after 16 times repeated uses.