期刊
POLYHEDRON
卷 170, 期 -, 页码 762-770出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2019.06.019
关键词
Mesoporous silica nanoparticles; Polyoxomolybdate; Heterogeneous catalysis; Oxidative desulfurization; Fuels
资金
- Associate Laboratory for Green Chemistry- LAQV - FCT/MCTES [POCI-01-0145-FEDER-007265, UID/QUI/50006/2019]
- CENIMAT, I3N [POCI-01-0145-FEDER-007688, UID/CTM/50025/2013]
- Fundo Europeu de Desenvolvimento Regional (FEDER) under the PT2020 Partnership Agreement
- national funds (OE), through FCT - Fundacao para a Ciencia e a Tecnologia
This work compares the stability and the catalytic efficiency of different ionic liquid phosphomolybdates ([BPY](3)[PMo12O40] and [BMIM](3)[PMo12O40]) with a cationic (propylpyridinium) functionalized mesoporous silica nanoparticle composite (PMo12O40@PPy-MSN). These were used as solid catalysts for the oxidative desulfurization of a multicomponent model diesel using hydrogen peroxide as oxidant and a polar immiscible extraction solvent. Ionic liquid ([BMIM][PF6] was successfully used as solvent to extract sulfur compounds from model diesel. The ionic liquid phosphomolybdates showed partial solubility in the ionic liquid phase, occurring some decomposition of their Keggin structure in the soluble reaction media, probably caused by their interaction with oxidant. On the other hand, the phosphomolybdate composite PMo12O40@PPPy-MSN presented high structural stability and only negligible leaching occurrence after various consecutive reaction cycles. The model diesel was near complete desulfurized after 3 h and consecutive desulfurization cycles were performed without loss of activity. Therefore, the immobilization of Keggin phosphomolybdate structure [PMo12O40](3-) using cationic propylpyridinium silica nanoparticle is an assertive strategy to produce stable and active heterogeneous catalysts. (C) 2019 Elsevier Ltd. All rights reserved.
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