@article { ISI:000532052100031,
	title = {Polyoxometalate@Periodic mesoporous organosilicas as active materials for oxidative desulfurization of diesels},
	journal = {Microporous and Mesoporous Materials},
	volume = {302},
	year = {2020},
	note = {<p>n/a</p>
},
	month = {{AUG 1}},
	pages = {110193},
	abstract = {<p>Novel material catalysts based in the active zinc-substituted polyoxotungstate ({[}PW11Zn(H2O)(39)](5-), abbreviated as PW11Zn) were efficiently used in the oxidative desulfurization of real and model diesels. These active catalytic center was strategically immobilized in a less hydrophilic periodic mesoporous organosilicas (PMOs), containing ethane-bridge (PMOE) and benzene-bridge (PMOB) walls, functionalized with (3-aminopropyl)triethoxysilane (aptes). The efficiency of the novel catalytic composites (PW11Zn@aptesPMOE and PM11Zn@aptesPMOB) was studied under oxidative desulfurization system (CODS) without the presence of an extraction solvent and also using a biphasic (diesel/extraction solvent) oxidative desulfurization system (ECODS). Both composites presented higher desulfurization efficiency under the solvent-free system, reaching ultra-low levels of sulfur compounds after only 1 h and using low ratio of H2O2/S = 4. The catalysts could be recycled without loss of activity for ten consecutive cycles. However, after the first desulfurization cycle complete desulfurization was achieved within only 30 min using PW11Zn@aptesPMOE composite. Also, the structure of PW it Zn@aptesPMOE demonstrated to be more stable than PW11Zn@aptesPMOB, probably due to the occurrence of some PW11Zn leaching from the PMOB surface, probably caused by the lower interaction of PW11Zn with the benzene-bridge PMOB wall. The most robust catalyst PW11Zn@aptesPMOE was used to desulfurize a real diesel achieving 75.9\% of desulfurization after 2 h. The catalyst was further recycled with success to treat real diesel.</p>
},
	issn = {{1387-1811}},
	doi = {{10.1016/j.micromeso.2020.110193}},
	url = {https://www.sciencedirect.com/science/article/pii/S1387181120301967},
	author = {Ribeiro, Susana O. and Almeida, Pedro L and Pires, Joao and Baltazar de Castro and Balula, Salete S.}
}
