Deep Oxidative Desulfurization of Fuels in the Presence of Brönsted Acidic Polyoxometalate-Based Ionic Liquids
作者:Argam Akopyan、Ekaterina Eseva、Polina Polikarpova、Anastasia Kedalo、Anna Vutolkina、Aleksandr Glotov
DOI:10.3390/molecules25030536
日期:——
Polyoxometalate-based ionic liquid hybrid materials with a pyridinium cation, containing Brönsted acid sites, were synthesized and used as catalysts for the oxidation of model and real diesel fuels. Keggin-type polyoxometalates with the formulae [PMo12O40]3−, [PVMo11O40]4−, [PV2Mo10O40]4−, [PW12O40]3− were used as anions. It was shown that increasing the acid site strength leads to an increase of dibenzothiophene
合成了基于多金属氧酸盐的离子液体杂化材料,带有吡啶鎓阳离子,含有布朗斯台德酸位点,被用作模型和实际柴油燃料氧化的催化剂。具有式 [PMo12O40]3-、[PVMo11O40]4-、[PV2Mo10O40]4-、[PW12O40]3- 的 Keggin 型多金属氧酸盐用作阴离子。结果表明,增加酸位强度导致二苯并噻吩转化为相应砜的增加。在含有烟酸衍生物作为阳离子和磷钼酸盐作为阴离子的催化剂存在下获得最佳结果。详细研究了催化剂用量、温度、反应时间、氧化剂用量等影响反应过程的主要因素。在最佳条件下二苯并噻吩完全氧化,得到90%以上的实际柴油(初始硫含量2050 ppm)脱硫率(氧化条件:NK-1催化剂,H2O2:S摩尔比10:1,摩尔比) S:Mo 8:1, 1 mL MeCN, 70 °C, 1 h)。合成的催化剂可以使用五次,但活性略有下降。