A New peroxotungsten heteropoly anion with special oxidizing properties: synthesis and structure of tetrahexylammonium tetra(diperoxotungsto)phosphate(3-)

Venturello, Carlo; D’Aloisio, Rino; Bart, J. C. J.; Ricci, Marco

doi:10.1016/0304-5102(85)85037-9

Cited by 366 publications

(138 citation statements)

References 13 publications

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“…Both the position and width of the diffraction reflexes are very close, which suggests fairly good structural stability in the W-MMM-E solids synthesized by the EISA technique. Raman spectra also did not show changes after treatment with H2O2 ( Figure 3, compare curves (3), (4) and (5), (6)). …”

Section: Hydrothermal Stability and Stability Towards H2o2mentioning

confidence: 89%

“…Tungsten is catalytically very active and is used in the formation of diverse compounds as a catalyst in a wide range of chemical processes including H 2 O 2 -mediated oxidation [1][2][3][4][5][6][7][8][9][10][11][12]. However, attempts to design heterogeneous tungsten-based catalysts with sufficient stability under turnover conditions of liquid-phase oxidation with H 2 O 2 have been rather unsuccessful, as yet.…”

Section: Introductionmentioning

confidence: 99%

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Tungsten-Based Mesoporous Silicates W-MMM-E as Heterogeneous Catalysts for Liquid-Phase Oxidations with Aqueous H2O2

et al. 2018

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Mesoporous tungsten-silicates, W-MMM-E, have been prepared following evaporation-induced self-assembly methodology and characterized by elemental analysis, XRD, N 2 adsorption, STEM-HAADF (high angle annular dark field in scanning-TEM mode), DRS UV-vis, and Raman techniques. DRS UV-vis showed the presence of two types of tungsten oxo-species in W-MMM-E samples: isolated tetrahedrally and oligomeric octahedrally coordinated ones, with the ratio depending on the content of tungsten in the catalyst. Materials with lower W loading have a higher contribution from isolated species, regardless of the preparation method. W-MMM-E catalyzes selectively oxidize of a range of alkenes and organic sulfides, including bulky terpene or thianthrene molecules, using green aqueous H 2 O 2 . The selectivity of corresponding epoxides reached 85-99% in up to 80% alkene conversions, while sulfoxides formed with 84-90% selectivity in almost complete sulfide conversions and a 90-100% H 2 O 2 utilization efficiency. The true heterogeneity of catalysis over W-MMM-E was proved by hot filtration tests. Leaching of inactive W species depended on the reaction conditions and initial W loading in the catalyst. After optimization of the catalyst system, it did not exceed 20 ppm and 3 ppm for epoxidation and sulfoxidation reactions, respectively. Elaborated catalysts could be easily retrieved by filtration and reused several times with maintenance of the catalytic behavior.

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Section: Hydrothermal Stability and Stability Towards H2o2mentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Tungsten-Based Mesoporous Silicates W-MMM-E as Heterogeneous Catalysts for Liquid-Phase Oxidations with Aqueous H2O2

et al. 2018

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“…) were extensively applied in the reaction of epoxidation of alkenes in the late 80s in biphasic system in the presence of quaternary ammonium cation (C 6 -C 18 ) whose role was to transfer the products from one phase to another [73][74][75]. The same approach was later used by Kozhevnikov et al [76] in the epoxidation of oleic acid by H 2 O 2 in mild conditions.…”

Section: Ionic Liquid: Polyoxometalates Hybridsmentioning

confidence: 99%

Hybrid Organic-Inorganic Materials Based on Polyoxometalates and Ionic Liquids and Their Application in Catalysis

Ivanova

2014

ISRN Chemical Engineering

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An overview of the recent advances in the field of polyoxometalate, ionic liquid hybrids, is proposed with a special attention paid to their application in catalysis, more precisely biphasic and heterogeneous catalysis. Both components of the hybrids are separately outlined pointing to their useful properties and potential for catalysis, followed by the description of the hybrids preparation and synergy between components in a large range of organic transformations. And finally a vision on the future developments is proposed.

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“…3, Catalyst A). [10] Moreover, since the hydrogen peroxide oxidation reaction is a two-phase reaction between the organic phase (raw material) and the liquid phase (hydrogen peroxide), simple mixing does not bind them, and it is known that the use of quaternary ammonium salt, which is a type of a phase transfer catalyst, is necessary to efficiently promote the reaction. Utilizing the findings from the prior research, we decided to develop the catalyst based on the combination of the tungsten metal catalyst and the phase transfer catalyst.…”

Section: Design Of a Tungsten Catalyst Based On Conventional Knowledgementioning

confidence: 99%

Clean and practical oxidation using hydrogen peroxide

Kon

Tanaka

Satō

2015

Synthesiology English edition

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A New peroxotungsten heteropoly anion with special oxidizing properties: synthesis and structure of tetrahexylammonium tetra(diperoxotungsto)phosphate(3-)

Cited by 366 publications

References 13 publications

Tungsten-Based Mesoporous Silicates W-MMM-E as Heterogeneous Catalysts for Liquid-Phase Oxidations with Aqueous H2O2

Tungsten-Based Mesoporous Silicates W-MMM-E as Heterogeneous Catalysts for Liquid-Phase Oxidations with Aqueous H2O2

Hybrid Organic-Inorganic Materials Based on Polyoxometalates and Ionic Liquids and Their Application in Catalysis

Clean and practical oxidation using hydrogen peroxide

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