Deep desulfurization of fuels catalyzed by surfactant-type decatungstates using H2O2 as oxidant

摘要: Abstract Oxidation of dibenzothiphene (DBT) in model oil with H2O2 using surfactant-type decatungstates Q4W10O32 (Q = (CH3)3NC16H33, (CH3)3NC14H29, (CH3)3NC12H25 and (CH3)3NC10H21) as catalysts was studied. The were synthesized characterized. suitable reaction condition deep desulfurization suggested: n(DBT):n(catalyst):n(H2O2) = 1:0.01:3, 60 °C for 0.5 h, under which the DBT conversion can reach 99.6% [(CH3)3NC16H33]4W10O32 catalyst. length carbon chains quaternary ammonium cations played a vital role catalytic activity decatungstates, that is, longer chain cation catalyst was, better this showed. exhibited best performance be recycled six times without significant decrease activity. Using benzothiphene (BT) 4,6-dimethyldibenzothiphene (4,6-DMDBT) substrates oil, also showed high During process, BT at 3.25 h, while 99.4% 4,6-DMDBT reached 1.25 h, temperature atmospheric pressure. sulfone separated from N,N-dimethylformamide (DMF) an extractant, sulfur content lowered 1000 to 4 ppm. For real diesel, removal 93.5% after five extraction.