resumo
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 degrees 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(O-2)(2)(di-tBu-bipy)]. By sequentially performing extractive desulfurization and ECODS steps, 76% sulfur removal was achieved for a real diesel (S-initial = 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.
palavras-chave
DEEP DESULFURIZATION; SOLVENT-EXTRACTION; ROOM-TEMPERATURE; LIQUID FUELS; COMPLEXES; EPOXIDATION; SULFUR; CYCLOOCTENE; ACID; PERFORMANCE
categoria
Chemistry
autores
Juliao, D; Gomes, AC; Pillinger, M; Valenca, R; Ribeiro, JC; Goncalves, IS; Balula, SS
nossos autores
Ana Catarina Costa Gomes Alves
Investigador Auxiliar
Diana Julião
Estudante de doutoramento
Isabel Maria de Sousa Gonçalves
Professor associado
Martyn Pillinger
Investigador Principalagradecimentos
This work was partly funded through the projects REQUIMTE-LAQV [FCT (Fundacao para a Ciencia e a Tecnologia) Ref. UID/QUI/50006/2013] and CICECO - Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/ 50011/2013), financed by national funds through the FCT/ MEC and when appropriate co-financed by FEDER (Fundo Europeu de Desenvolvimento Regional) under the PT2020 Partnership Agreement. The FCT and the European Union are acknowledged for grants to D. J. (SFRH/BD/102783/2014) and A. C. G. (SFRH/BPD/108541/2015) co-funded by MCTES and the European Social Fund through the program POPH of QREN.