A sustainable peroxophosphomolybdate/H2O2 system for the oxidative removal of organosulfur compounds from simulated and real high-sulfur diesels
authors Juliao, D; Gomes, AC; Cunha-Silva, L; Valenca, R; Ribeiro, JC; Pillinger, M; de Castro, B; Goncalves, IS; Balula, SS
nationality International
journal APPLIED CATALYSIS A-GENERAL
author keywords Oxidative desulfurization; Diesel; Hydrogen peroxide; Dibenzothiophene; Peroxophosphomolybdate
keywords CAMBRIDGE STRUCTURAL DATABASE; ULTRA-DEEP DESULFURIZATION; GAS OIL; FUELS; COMPLEXES; MODEL; MOLYBDENUM; EXTRACTION; REACTIVITY; KINETICS
abstract Highly efficient, deep desulfurization of a multi-component model diesel containing benzothiophene (BT), dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) has been achieved by using the peroxophosphomolybdate [(n-C4H9)(4)N](3)(PO4[MoO(O-2)(2)](4)} (Q(3)PMo(4)) directly as catalyst, and aqueous H2O2 as oxidant. Q(3)PMo(4) behaves as a heterogeneous catalyst in the complete oxidation of the various sulfur compounds to the corresponding sulfones within 3 h at 70 degrees C, using a relatively low H2O2/S molar ratio of 3.7, and could be recycled for ten times with only a minimal decrease in activity. A study was performed to adapt the catalyst Q(3)PMo(4) for the removal of sulfur from a real untreated diesel while maintaining a low, economically desirable, H2O2/S molar ratio of 3.7. The highest desulfurization performance was achieved in the presence of an extraction solvent during the catalytic oxidative stage, reinforced by two extraction steps before and after sulfur oxidation. Under these conditions, the sulfur content of the real diesel was reduced from 2300 to 500 ppm (78% desulfurization efficiency) after 3 h.
publisher ELSEVIER
issn 0926-860X
year published 2020
volume 589
digital object identifier (doi) 10.1016/j.apcata.2019.117154
web of science category Chemistry, Physical; Environmental Sciences
subject category Chemistry; Environmental Sciences & Ecology
unique article identifier WOS:000501638500011
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journal analysis (jcr 2019):
journal impact factor 5.006
5 year journal impact factor 4.831
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