柴油吸附脱硫中活性炭载体的改性研究

Study on Modification of Activated Carbon in Adsorptive Desuifurization

采用除灰分、氧化、负载金属活性组分等活化方法对活性炭载体进行改性,并进行了模型油中噻吩类化合物的吸附脱除性能研究,用BET、SEM、TEM、FTIR等方法对改性前后活性炭的微观性质进行表征。考察了负载量、浸渍时间对吸附脱硫效果的影响,得出吸附剂的最佳制备条件:用HCl除灰分,HNO3进行氧化,摩尔浓度为20%的Co(NO3)2溶液进行等体积浸渍,且浸渍时间为12h时活性炭基吸附剂的脱硫效果最好,脱硫率可达88.6%。最后对吸附机理进行了初步探讨,钴对噻吩的吸附作用较强,可能是通过M-S键作用对噻吩进行脱除的。

Activated carbon was modified by ash removal, oxidation and impregnating with metal activated components to investigate its desulfurization performance for thiophene in model, BET, SEM, TEM and FTIR methods were used to characterize the pore structure and micro-nature of the activated carbon. The effect of the loading amounts and immersion time of adsorbents on desulfurization performance were stud- ied. The optimum preparation conditions for the AC were obtained as follows.the activated carbon based adsorbents which were de-ashed by HC1, oxidized with HNOaand impregnated with Co（NO3）2molarity of 20% for 12 hours show the best desulfurization performance with 88. 6~ desulfurization rate. Possible ad- sorptive mechanism that Co has a stronger adsorption removal ability with thiophene through M-S com- plexion effect which was also studied at last.