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A recyclable ionic liquid-oxomolybdenum( vi ) catalytic system for the oxidative desulfurization of model and real diesel fuel

2016; Royal Society of Chemistry; Volume: 45; Issue: 38 Linguagem: Inglês

10.1039/c6dt02065h

1477-9234

Diana Julião, Ana C. Gomes, Martyn Pillinger, Rita Valença, Jorge C. Ribeiro, Isabel S. Gonçalves, Salete S. Balula,

Asymmetric Hydrogenation and Catalysis

The oxidative desulfurization of model and real diesel has been studied using the complex [MoO2Cl2(4,4'-di-tert-butyl-2,2'-bipyridine)] as (pre)catalyst, aq. H2O2 as oxidant, and an ionic liquid as extraction solvent. Under moderate conditions (50 °C) and short reaction times (<3 h), dibenzothiophene, 4-methyldibenzothiophene and 4,6-dimethyldibenzothiophene could be completely removed from the model diesel. The (pre)catalyst 1 was transformed in situ to the active catalyst [MoO(O2)2(di-tBu-bipy)]. By sequentially performing extractive desulfurization and ECODS steps, 76% sulfur removal was achieved for a real diesel (Sinitial = 2300 ppm). For both the model and real diesels, the catalyst/IL phase could be easily recycled and reused with no loss of desulfurization efficiency.