聚合离子液体磷钨酸盐合成及催化模拟油氧化脱硫

Synthesis of P/W-coupled polyionic liquids for oxidative desulfurization of model oil

摘要: 合成了新型的聚合离子液体磷钨酸盐(聚1-丁基-3-乙烯基咪唑磷钨酸盐)(PBVImPW), 采用FT-IR、XRD和TG进行表征, 通过CHN元素和ICP分析确定其结构。催化剂用于过氧化氢为氧化剂的模拟油品氧化脱硫反应。考察反应温度、氧硫比、催化剂用量等对脱硫率的影响。结果表明, 当反应温度为50 ℃, n(H₂O₂)/n(S) 为8, n (PBVImPW (P))/n (BT) 为0.4:1.0, 反应时间150 min时, 苯并噻吩(BT) 的转化率可以达到99.4%。催化剂可回收重复使用四次, 催化活性无明显下降。

Abstract: A novel PW-coupled polyionic liquid (1-n-butyl-3-vinylimidazolium phosphotungstate) (PBVImPW) was successfully synthesized and characterized by FT-IR, XRD, TG, ICP and CHN analysis. The prepared catalyst was applied in oxidative desulfurization processes of the model oil in the presence of H₂O₂. Several parameters including temperature, time, the amount of hydrogen peroxide and catalyst were investigated. PBVImPW is proved to be a highly efficient catalyst, and 99.4% benzothiophene conversion is achieved at reaction temperature of 50 ℃, n(H₂O₂)/n(S) ratio of 8, n(PBVImPW (P))/n(BT) ratio of 0.4 and reaction time of 150 min. There is not a significant decrease in the activity of the catalyst after being recycled four times.