Oxidation of Dibenzothiophene by Hydrogen Peroxide Catalyzed by Solid Bases

Palomeque, Jorge; Clacens, Jean‐Marc; Figuéras, F.

doi:10.1006/jcat.2002.3721

Cited by 22 publications

(20 citation statements)

References 16 publications

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“…9C) has a single signal, centred at 6.7 and 7.5 ppm, respectively, which was assigned to Al octahedrally coordinated to hydroxyl groups in the hydrotalcite-like structure. This is in agreement with pre- viously reported results [40] and with the assumption that Mg 2+ cations are isomorphically substituted by Al 3+ ions in the hydrotalcite structure. As noted earlier, calcination of the hydrotalcite yields a mixture of Mg and Al oxides.…”

Section: Ir Spectrasupporting

confidence: 94%

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Epoxidation of styrene with hydrogen peroxide using hydrotalcites as heterogeneous catalysts

Kirm

Medina

Rodrı́guez

et al. 2004

Applied Catalysis A: General

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Section: Ir Spectrasupporting

confidence: 94%

“…14), in agreement with the literature results given for the oxidation reaction of dibenzothiophene by hydrogen peroxide [40]. Fig.…”

Section: Effect Of the Solventsupporting

confidence: 91%

Epoxidation of styrene with hydrogen peroxide using hydrotalcites as heterogeneous catalysts

Kirm

Medina

Rodrı́guez

et al. 2004

Applied Catalysis A: General

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“…Keywords: aluminophosphates · cobalt · oxidative desulfurization · redox catalysts · zeolites stenic acid, [7] supported metals, [8] and molecular sieves [9,10] [11][12][13][14] Ti and V cations in zeolite frameworks are also active. [10,15] The structure of the zeolite (MFI, BEA, MEL) [16][17][18] and the nature of the solvent [19,20] influence oxidation rates.…”

Section: Introductionmentioning

confidence: 99%

Selective Catalytic Oxidation of Organosulfur Compounds with tert‐Butyl Hydroperoxide

Chica¹,

Gatti²,

Modén³

et al. 2006

Chemistry A European J

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Rates and selectivities for the oxidation of various organosulfur compounds with tert-butyl hydroperoxide were measured on CoAPO-5 (APO = aluminophosphate; Co/P = 0.05), Co/H-Y (Co/Al = 0.15), and MoO(x)/Al2O3 (15 % wt MoO3). Rates increased with increasing electron density at the sulfur atom (methyl phenyl sulfide>diphenyl sulfide>4-methyldibenzothiophene>2,5-dimethyl thiophene). Rates (per metal atom) were significantly higher on CoAPO-5 than on Co/H-Y, MoO(x)/Al2O3, or homogeneous Co acetate catalysts. Small amounts of sulfoxides (1-oxide) were detected on all catalysts at low reactant conversions, together with their corresponding sulfones; at higher conversions, only sulfones (1,1-dioxide) were detected, indicating that the oxidation of sulfoxides is much faster than for organosulfur reactants in the sequential oxidation pathways prevalent on these catalysts. Framework Co cations were not leached from CoAPO-5 during the oxidation of 4-methyldibenzothiophene, but most exchanged Co cations in H-Y and >20 % of Mo cations in MoO(x)/Al2O3 were extracted during these reactions. The fraction of redox-active Co cations in CoAPO-5 and Co/H-Y was measured by reduction-oxidation cycles using H2 and O2 and by UV-visible spectroscopy. This fraction was much larger in CoAPO-5 (0.35) than in Co/H-Y (0.01), consistent with the higher oxidation rates measured on CoAPO-5 and with the involvement of redox-active species in kinetically-relevant steps in catalytic oxidation sequences. Redox-active Co cations at framework positions within accessible channels are required for catalytic activity and structural stability during oxidative desulfurization, whether hydroperoxides are used as reactants or as intermediates (when O2 is used as the oxidant).

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“…Oxidative desulfurization is considered as the latest unconventional desulfurization process which involves chemical oxidation of divalent organic sulfur compounds to the corresponding hexavalent sulfur, also known as sulfone [53][54][55][56][57][58][59][60][61].…”

Section: Oxidative Desulfurization (Ods)mentioning

confidence: 99%

Recent Advances in the Science and Technology of Desulfurization of Diesel Fuel Using Ionic Liquids

Kowsari¹

2013

Ionic Liquids - New Aspects for the Future

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Oxidation of Dibenzothiophene by Hydrogen Peroxide Catalyzed by Solid Bases

Cited by 22 publications

References 16 publications

Epoxidation of styrene with hydrogen peroxide using hydrotalcites as heterogeneous catalysts

Epoxidation of styrene with hydrogen peroxide using hydrotalcites as heterogeneous catalysts

Selective Catalytic Oxidation of Organosulfur Compounds with tert‐Butyl Hydroperoxide

Recent Advances in the Science and Technology of Desulfurization of Diesel Fuel Using Ionic Liquids

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