Oxidative desulphurisation of oils via hydrogen peroxide and heteropolyanion catalysis

Collins, Frances M.; Lucy, Andrew R.; Sharp, Christopher

doi:10.1016/s1381-1169(96)00251-8

Cited by 374 publications

(184 citation statements)

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“…Studies have shown that hydrogen peroxide appears to be a promising oxidizing agent in the catalyzed oxidation of sulfur compounds in fuels due to the fact that it offers a high amount of active oxygen and produces only water as a by-product. [18][19][20][21][22][23][24][25] The activity and selectivity of metal complexes immobilized on polymer microspheres have been reported in our previous studies to be as efficient as unsupported metal complexes. [26][27][28][29] In an attempt to improve the surface area of the polymeric support, electropsun polymer fibres have also been reportedly employed as an alternative.…”

Section: Introductionmentioning

confidence: 74%

“…In search for a complementary approach to the HDS, biodesulfurization (BDS) and oxidative desulfurization (ODS) technologies were introduced. [5][6][7][8][9][10][11][12][13][14][15][16][17] Bio-desulfurization involves the use of microorganisms (e.g. bacteria) to desulfurize fuels under biological processes [5][6][7][8][9][10] while the ODS process involves the oxidation of the sulfur atoms followed by the extraction of the oxidation products.…”

Section: Introductionmentioning

confidence: 99%

“…bacteria) to desulfurize fuels under biological processes [5][6][7][8][9][10] while the ODS process involves the oxidation of the sulfur atoms followed by the extraction of the oxidation products. [11][12][13][14][15][16][17] Several oxidants such as nitric acid and/or nitrogen oxides, 11 organic hydroperoxides, 12,13 peroxyacids, 14,15 and hydrogen peroxide, 16,17 have been employed for the catalyzed oxidation of organosulfur compounds in fuels. Studies have shown that hydrogen peroxide appears to be a promising oxidizing agent in the catalyzed oxidation of sulfur compounds in fuels due to the fact that it offers a high amount of active oxygen and produces only water as a by-product.…”

Section: Introductionmentioning

confidence: 99%

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The oxidation of dibenzothiophene using oxidovanadium(IV)-containing nanofibres as catalyst

OGUNLAJA,

HOSTEN,

TSHENTU

2015

S.Afr.j.chem

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Polyvinylbenzylchloride nanofibres were fabricated by the electrospinning technique and subsequently functionalized with a tetradentate ligand, 2,2'-(1E,1'E)-(1,2-phenylenebis(azan-1-yl-1-ylidene))bis(methan-1-yl-1-ylidene)bis(4-aminophenol). VO 2+ was then incorporated into the nanofibres to produce the catalyst VO-fibres. Microanalysis, TG and FT-IR were used for the characterization of VO-fibre, and EPR also confirmed the presence of oxidovanadium(IV) within the nanofibres. Oxidation of dibenzothiophene (DBT) was investigated by varying the catalyst amount, substrate amount, oxidant and temperature, and the progress of oxidation was followed with a gas chromatograph fitted with a flame ionization detector. An increase in the amount of oxidant caused an increase in the amount of dibenzothiophene sulfone (DBTO 2 ), while a decrease in the quantity of dibenzothiophene resulted in an increase in the overall yield of dibenzothiophene sulfone under a constant temperature and oxidant (H 2 O 2 ) concentration. Dibenzothiophene sulfone was confirmed as the oxidation product through 1 H-NMR spectroscopy and single crystal X-ray diffraction. KEYWORDSVanadium(IV) catalyst, nanofibres, dibenzothiophene, oxidation, hydrogen peroxide (H 2 O 2 ).

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Section: Introductionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The oxidation of dibenzothiophene using oxidovanadium(IV)-containing nanofibres as catalyst

OGUNLAJA,

HOSTEN,

TSHENTU

2015

S.Afr.j.chem

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“…[59][60][61][62][63][64][65][66][67] Sulfones have been utilized as the syntons for total synthesis of bioactive natural compounds. As depicted in parenthesis in Table 3, oxidation of 13a-k with hydrogen peroxide in the absence of PWAA proceeded sluggishly to give mainly the corresponding sulfoxides 14a-k in low to moderate yields 68) rather than sulfones 15a-k. Meeting our expectations, PWAA efficiently promoted the oxidation of sulfides to give sulfones under similar conditions.…”

Section: Oxidation Of Sulfidesmentioning

confidence: 99%

Self-Assembled Complexes of Non-cross-linked Amphiphilic Polymeric Ligands with Inorganic Species: Highly Active and Reusable Solid-Phase Polymeric Catalysts

Yamada

2005

CHEMICAL & PHARMACEUTICAL BULLETIN

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IntroductionDevelopment of immobilized and insoluble metal catalysts is of great interest in recent organic chemistry. [1][2][3][4][5][6][7][8][9] The simple recovery of catalysts by filtration and their reuses resulted in enhancing the economical evaluation of the reaction. At the same time, there is a prospect that the environmental pollution caused by residual metals in the waste fluid will be decreased. Although a great deal of effort has been made to carry out such ideal reactions using immobilized metal catalysts, what seems to be lacking is the efficiency of the catalytic systems. It is obvious that the heterogeneous catalytic systems exhibit generally lower activity than the homogeneous ones. Besides, it is expected that the activity of the catalysts decreases gradually in the recycled systems because the metal species leaches away from their supports. Taking these into consideration, we decided to concentrate on developing insoluble metal catalysts which are highly active and stable. We designed that they were still effective in the use of ppm mol eq, and in the recycled use of many times in any reaction media. To achieve the challenging theme, we have focused on the amphiphilic insoluble catalysts based on a novel concept (Chart 1).Over the past few decades, a considerable numbers of study have been made on solid-phase catalysts which were immobilized with cross-linked polystyrene resins, silica gels or metals. These catalytic systems, however, generally resulted in lower catalytic activity compared with their soluble counterparts, and were often obliged to use hazardous chlorohydrocarbon solvents. [10][11][12][13][14][15] Besides, reuse of these catalysts was often difficult owing to the gradual decline of the catalytic activity. These problems made them less practical.In traditional triphase catalysts, as I have mentioned before, a catalytic species was anchored to a linker that was immobilized to a polymer resin or silica gel (Chart 1, above). In July 2005Chem. Pharm. Bull. 53(7) 723-739 (2005)

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“…The reaction time for a complete conversion can be shortened to 30 and 8 min as the reaction temperature is elevated to 60 and 90°C, respectively [20]. It is worthwhile to point out that these organic sulfides and their derivatives are the most refractory sulfurcontaining molecules present in diesel and are extremely difficult to remove using conventional hydrodesulfurization (HDS) [22][23][24]. This provides the possibility for selective oxidation of sulfides present in fuel oils combined with extraction for ultra-deep desulfurization [20].…”

Section: Selective Oxidation Of Real Diesel In W/o Emulsionmentioning

confidence: 99%

Selective Oxidations on Recoverable Catalysts Assembled in Emulsions

Gao

Jiang

et al. 2005

Top Catal

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Catalysts assembled in emulsions are found to be potentially recoverable and efficient for a number of catalytic reactions. The catalysts composed of polyoxometalate anions and quaternary ammonium cations have been designed and synthesized according to the catalytic reactions and by optimizing the structures of cations and anions. The catalysts act essentially as surfactants, which are uniformly distributed in the interface of the emulsion droplets, and accordingly behave like homogeneous catalysts. The catalysts show remarkable selectivity and activity in the oxidation of sulfur-containing molecules to sulfones in diesel and the selective oxidation of alcohols to ketones, using H 2 O 2 as oxidant. For an example, the catalyst demonstrated over 96% efficiency of H 2 O 2 and~100 % selectivity to sulfones for the selective oxidation of sulfur-containing molecules in real diesel. Moreover, the catalysts can be separated and recycled by a simple demulsification and re-emulsification.

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Oxidative desulphurisation of oils via hydrogen peroxide and heteropolyanion catalysis

Cited by 374 publications

References 9 publications

The oxidation of dibenzothiophene using oxidovanadium(IV)-containing nanofibres as catalyst

The oxidation of dibenzothiophene using oxidovanadium(IV)-containing nanofibres as catalyst

Self-Assembled Complexes of Non-cross-linked Amphiphilic Polymeric Ligands with Inorganic Species: Highly Active and Reusable Solid-Phase Polymeric Catalysts

Selective Oxidations on Recoverable Catalysts Assembled in Emulsions

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