有机钼多金属氧酸盐在柴油氧化脱硫中的应用

通过复分解法合成了3种基于Mo8O4-26阴离子的四烷基铵钼多金属氧酸盐,并将其作为催化剂,质量分数为30%H2O2溶液为氧化剂、1-己基-3-甲基咪唑四氟硼酸盐离子液体(C6MIM]BF4)为萃取剂,用于柴油的催化氧化脱硫。分别考察了催化剂摩尔分数、反应温度、剂油体积比、反应时间、氧化剂用量等条件对模拟油品脱硫率的影响,确定了最优化反应条件,并将其应用于实际油品的脱硫中。结果表明,在60℃反应条件下,反应时间1h,当催化剂摩尔分数为5%、剂油体积比为1∶5、n(氧化剂)/n(硫化物)为6∶1时,该催化氧化-萃取体系对模拟油品(初始含硫质量分数为1 164μg/g)有较高的脱硫率,一次脱硫率可达95%以上。对抚顺石化公司生产的催化裂化柴油(初始含硫质量分数为850μg/g)一次脱硫率约为92%。

Oxidation Desulfurization of Organic Molybdenum Polyoxometalate in Diesel Fuel

Three kinds of molybdenum polyoxometalates using Mo8046 as the anion, quaternary ammonium salts as the cation have been synthesized. And the catalysts were used in the catalysis and oxidation desulfurization of diesel fuel system with oxidant H2 02 （30%） as oxidant and extractant C6 MIM]BF4 as extraction agent. The desulfurization of model diesel fuel was optimized by investigating different reaction conditions, such as the dosage of catalysts, reaction temperature, the ratio of C6MIM]BF4 and diesel fuel ,reaction time, the dosage of oxidant and so on and were applied in real diesel fuel. The results showed that the best desulfurization rate at 60 ℃ was obtained after 1 h under the condition of n （catalyst）/n （sulfide） = 5 %, V（C6 MIM]BF4 ）/V（oil） = 1 ： 5,n （oxidant）/n （sulfide） = 6 ： 1.The desulfurization rate reached 95% for the model diesel fuel （S]o=1164μg/g） and 92% for the FCC diesel（S]o=850 μg/g）.