Iron(III)-substituted polyoxotungstates immobilized on silica nanoparticles: Novel oxidative heterogeneous catalysts

Sousa, Joana L. C.; Santos, Isabel C.M.S.; Simões, Mário M. Q.; Cavaleiro, José A. S.; Nogueira, Helena I. S.; Cavaleiro, Ana M. V.

doi:10.1016/j.catcom.2010.11.005

Cited by 51 publications

(13 citation statements)

References 32 publications

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“…These products distribution is somewhat different from that obtained in homogeneous system. In the same year, they reported synthesis and characterization of Fe (III) substituted polyoxotungstates immobilized on silica nanoparticles (112). The nanocomposites synthesized were tested as heterogeneous catalysts in the epoxidation of geraniol with H 2 O 2 .…”

Section: Supported Tmspomsmentioning

confidence: 99%

Keggin-type lacunary and transition metal substituted polyoxometalates as heterogeneous catalysts: A recent progress

et al. 2016

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In this article we discussed synthesis and catalytic applications of heterogeneous catalysts based on lacunary polyoxometalates (LPOMs) and transition metal substituted polyoxometalates (TMSPOMs), however exclusively the focus has been given to the mono LPOMs and mono-TMSPOMs. As the field of supported LPOMs/TMSPOMs is upcoming important field, some aspects about choice of support as well as methods of supporting have also been described. We also include a few of our new research results in order to understand the effect of support and active species as well as choice of organic transformation. ARTICLE HISTORY

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Section: Supported Tmspomsmentioning

confidence: 99%

Keggin-type lacunary and transition metal substituted polyoxometalates as heterogeneous catalysts: A recent progress

et al. 2016

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“…Some POMs such as phosphotungstic acid (H 3 PW 12 O 40 , PW) and phosphomolybdic acid (H 3 PMo 12 O 40 , POM) have a soccer ball-shaped Keggin structure [10]. They have attracted much attention as highly selective electrophilic and oxidation catalysts because of their properties such as inorganic nature and the tunability of redox and acid properties [11][12][13][14][15][16][17]. There are some problems in using POMs as catalysts, such as low thermal stability, extreme solubility in polar solvents and low unsupported surface area, which is an important limitation for catalytic systems.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the catalytic behavior of a Cu coordination polymer capped polyoxometalate as an oxidation catalyst

Farzaneh

Moghzi

2015

Reac Kinet Mech Cat

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A multifunctional organic-inorganic hybrid based on a Cu coordination polymer capped polyoxometalate (H 3 PMo 12 O 40 ) designated as compound 1 with [Cu I (4,4 0 -bipy)] 3 [PMo 10 VI Mo 2 V O 40 {Cu II (2,2 0 -bipy)}] formula was prepared using CuCl 2 Á2H 2 O, 4,4 0 -bipy, 2,2 0 -bipy and H 3 PMo 12 O 4 in water under hydrothemal conditions. The prepared compound 1 was characterized by FTIR, XRD and chemical analysis techniques. It was found that the compound successfully catalyzes the epoxidation of various alkenes such as diphenyl ethylene, trans-stilbene, cyclohexene, norbornene, styrene and cyclooctene and oxidation of alkanes such as fluorene, adamantane, diphenylmethane, cyclohexane and cyclooctane, in acetonitrile with 20-99 % conversion and 53-100 % selectivity with tert-butyl hydroperoxide as oxidant under optimized condition. This heterogeneous catalyst could be easily recovered and reused after reaction without loss of activity.

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“…,. A strategy commonly explored is supporting the Keggin HPAs on a solid support with high surface area . Although there are several examples describing the successfully use of the solid‐supported HPAs, the leaching problems and the laborious synthesis are some drawbacks of these supported catalysts …”

Section: Introductionmentioning

confidence: 99%

K5PW11NiO39‐catalyzed oxidation of benzyl alcohol with hydrogen peroxide

et al. 2019

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In this work, we synthesized a series of metal-substituted potassium heteropolyacid salts and investigated its catalytic activity on oxidation of benzyl alcohol with H 2 O 2 under homogeneous (CH 3 CN) and biphasic (toluene/water) conditions. The Keggin heteropolyacids were converted to lacunar salts (i. e., K 7 PW 11 O 39 ; K 7 PMo 11 O 39 and K 8 SiW 11 O 39 ), which had their vacancies filled with metal cations (i. e., Al 3 + , Fe 3 + , Co 2 + , Cu 2 + , and Ni 2 + ), generating the metal-substituted salts. The K 5 PW 11 NiO 39 proved to be the most efficient catalyst. The synergic effect raised between the PW 11 O 39 7À anion and Ni 2 + cation improved the redox properties and the activity of the catalyst. The K 5 PW 11 NiO 39 catalyst was able to promote the benzyl alcohol oxidation with hydrogen peroxide in biphasic conditions in the absence of phase transfer catalyst. Benzaldehyde and benzoic acid were the main products. The effects of main reaction parameters were assessed. The K 5 PW 11 NiO 39 catalyst was successfully recovered and reused without losing activity.

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Iron(III)-substituted polyoxotungstates immobilized on silica nanoparticles: Novel oxidative heterogeneous catalysts

Cited by 51 publications

References 32 publications

Keggin-type lacunary and transition metal substituted polyoxometalates as heterogeneous catalysts: A recent progress

Keggin-type lacunary and transition metal substituted polyoxometalates as heterogeneous catalysts: A recent progress

Investigation of the catalytic behavior of a Cu coordination polymer capped polyoxometalate as an oxidation catalyst

K5PW11NiO39‐catalyzed oxidation of benzyl alcohol with hydrogen peroxide

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