Journal
FUEL
Volume 166, Issue -, Pages 268-275Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2015.10.095
Keywords
Oxidative/extractive desulfurization; Zinc substituted polyoxometalates; Hybrid polyoxometalates; Real diesel
Categories
Funding
- FEDER (Fundo Europeu de Desenvolvimento Regional) [PT2020]
- FCT (Fundacao para a Ciencia e a Tecnologia) [UID/QUI/50006/2013]
- Portuguese Nuclear Magnetic Resonance Network (PRNMR)
- CICECO Laboratory, University of Aveiro, Portugal
- [SFRH/BD/95571/2013]
- [SFRH/BD/102783/2014]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/102783/2014] Funding Source: FCT
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The desulfurization efficiency of various hybrid zinc-substituted polyoxometalates ([PW11Zn(H2O)O-39](5-), abbreviated as PW11Zn) was here investigated for the first time and optimized using sustainable systems conciliating successfully the liquid-liquid extraction and the oxidative catalytic process. Initially, the desulfurization studies were performed using a model diesel containing a mixture of the most refractory sulfur compounds and later extended to an untreated real diesel. In both cases, acetonitrile was used as extraction solvent and aqueous H2O2 as oxidant. High level of desulfurization was achieved using model and untreated diesels after few hours. The quaternary ammonium catalysts (TBAPW(11)Zn and ODAPW(11)Zn) showed higher catalytic desulfurization efficiency than the ionic liquid catalyst ( BMIPW11Zn). The TBAPW(11)Zn behaved as a homogeneous catalyst immobilized in the extraction solvent, while the ODAPW(11)Zn with the long carbon chain behaved as a heterogeneous catalyst capable to be recovered from the system. Both quaternary ammonium catalysts showed to be successfully reused/recycled for various consecutive desulfurization cycles. (C) 2015 Elsevier Ltd. All rights reserved.
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