用Dawson型聚氧钨酸乳液催化氧化燃油超深度脱硫

Ultra-deep Oxidative Desulfurization of Fuel Oil Catalyzed by Dawson-Type Polyoxotungstate Emulsion Catalysts

合成了Dawson型聚氧钨酸乳液催化剂Q18P2W18,Q18P2W17,和Q18P2W12.采用红外光谱和固体核磁技术对其进行了表征,并用于温和条件下H2O2氧化4,6-二甲基二苯并噻吩(4,6-DMDBT)、二苯并噻吩(DBT)、苯并噻吩(BT)和2,5-二甲基噻吩(2,5-DMT)等含硫化合物的反应中.结果表明,各催化剂的活性大小顺序为Q18P2W12>Q18P2W17>Q18P2W18.含硫化合物的氧化活性顺序为DBT>4,6-DMDBT>BT>2,5-DMT.在60oC反应30min内,Q18P2W12催化剂能够催化氧化BT完全转化成相应的砜.

The Dawson-type polyoxotungstate emulsion catalysts Q18P2W18,Q18P2W17,and Q18P2W12 were successfully synthesized and characterized by IR and 31P MAS NMR. They were used for the oxidation of sulfur-containing compounds such as 4,6-dimethyldibenzothiophene（4,6-DMDBT） ,dibenzothiophene（DBT） ,benzothiophene（BT） ,and 2,5-dimethythiophene（2,5-DMT） with H2O2 as an oxidant under mild conditions. The activity of the catalysts decreased in the order： Q18P2W12 Q18P2W17 Q18P2W18. The oxidative reactivity of the sulfur-containing compounds decreased according to DBT 4,6-DMDBT BT 2,5-DMT. BT was completely oxi-dized into the corresponding sulfone upon catalysis by Q18P2W12 at 60 °C for 30 min.