Vanadium-substituted Keggin heteropolycompounds as catalysts for ecofriendly liquid phase oxidation of 2,6-dimethylphenol to 2,6-dimethyl-1,4-benzoquinone

Villabrille, Paula Isabel; Romanelli, Gustavo Pablo; Vázquez, Patricia; Cáceres, Carmen Victoria

doi:10.1016/j.apcata.2004.04.028

Cited by 69 publications

(69 citation statements)

References 26 publications

(32 reference statements)

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“…1. In these spectra, a splitting of the P-O a band and a shift of the Mo-O d band were observed compared to those of V-free HPA [24]. The M10PV2 and M6PV6 acids show similar behavior.…”

Section: Characterization Of Catalystssupporting

confidence: 49%

“…Keggin vanadium-based structures have also been reported [24]. More typical than pure vanadium-addenda complexes are the mixed addenda complexes of molybdenum and/or tungsten, in which one to three of the addenda are replaced by vanadia.…”

Section: Introductionmentioning

confidence: 90%

“…There is a weakness of the V-O a interaction and the protons reside mainly in the bridging water moieties forming H 5 O 2 + . This modification changes the charges of different oxygen atoms of Keggin primary structure, mainly O b , and could be related to a higher acid strength of a new proton [24]. In the case of M10PV2 and M6PV6 acids, the acid strength decreased to 400 and 100 mV (Fig.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

“…The heteropolyacids H 4 PMo 11 VO 40 (M11PV1), H 5 PMo 10 V 2 O 40 (M10PV2) and H 9 PMo 6 V 6 O 40 (M6PV6) were prepared by a hydrothermal synthesis method [24]. As example is presented M11PV1 synthesis according to the next procedure: a stoichiometric mixture of 0.98 g of phosphoric acid, 0.91 g of vanadium pentoxide and 14.4 g of molydenum trioxide was suspended in 150 mL of distilled water.…”

Section: Catalyst Preparationmentioning

confidence: 99%

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Keggin heteropolycompounds as catalysts for liquid-phase oxidation of sulfides to sulfoxides/sulfones by hydrogen peroxide

Romanelli

Villabrille

Cáceres

et al. 2011

Catalysis Communications

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H 4 PMo 11 VO 40 , H 5 PMo 10 V 2 O 40 and H 9 PMo 6 V 6 O 40 acids and an acidic pyridinium salt of H 4 PMo 11 VO 40 were synthesized. They were characterized by FT-IR and the variations of their acid properties were determined by titration with n-butylamine. They proved to be highly active and selective catalysts for the hydrogen peroxide oxidation of methyl phenyl sulfide to the corresponding sulfoxide or sulfone. The conversion and selectivity results may be explained in terms of the co-existence of acidic and oxidative properties in the catalysts. On the other hand, a convenient catalytic homogeneous procedure has been found to oxidize different sulfides to sulfoxides or sulfones, with 35% aqueous H 2 O 2 , using (PyH)H 3 PMo 11 VO 40 as catalyst. The oxidation reaction is carried out at room temperature for sulfoxides or 40°C for sulfones and requires a short time. The sulfoxides or sulfones were obtained with excellent yields by controlling the amount of H 2 O 2 .

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“…1. In these spectra, a splitting of the P-O a band and a shift of the Mo-O d band were observed compared to those of V-free HPA [24]. The M10PV2 and M6PV6 acids show similar behavior.…”

Section: Characterization Of Catalystssupporting

confidence: 49%

Section: Introductionmentioning

confidence: 90%

Section: Characterization Of Catalystsmentioning

confidence: 99%

Section: Catalyst Preparationmentioning

confidence: 99%

See 2 more Smart Citations

Keggin heteropolycompounds as catalysts for liquid-phase oxidation of sulfides to sulfoxides/sulfones by hydrogen peroxide

Romanelli

Villabrille

Cáceres

et al. 2011

Catalysis Communications

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“…Four strong characteristic peaks were found in the spectra of all samples which are attributed to the vibration bands of Keggin structure. The Keggin ion bands were observed at 1066 cm - [16,17]. Comparison of the FT-IR of the catalyst before and after calcination, little difference was observed, indicating the prepared catalyst reserved the Keggin structure after reaction with Cu or Fe cations.…”

Section: Selective Catalytic Oxidation Of Mal To Maamentioning

confidence: 99%

Cu or Fe Modified Cs2HPMo12O40 as Catalysts for Selective Oxidation of Methacrolein

Wang¹,

Liu²

2016

J Thermodyn Catal

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Selective Palladium‐Catalyzed Dehydrogenation of Limonene to Dimethylstyrene

2010

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Conditions for the selective dehydrogenation of (+)‐limonene 1 to the polymer building block dimethylstyrene 2 are described. The reaction occurs smoothly in the presence of Pd(OTFA)2 as catalyst and CuCl2 as oxidant. High selectivity for retaining the exocyclic double bond during aromatization is achieved (>14:1). Initially, variable‐temperature NMR experiments, under stoichiometric conditions, showed a stepwise formation of a π‐allyl intermediate and subsequent reaction to give a mixture of products. However, kinetic experiments showed a sigmoidal curve, pointing to the heterogeneous nature of the catalytically active species. A number of experiments were undertaken to differentiate between homogeneous, molecularly defined catalysis and heterogeneous, nanocluster‐based catalysis. Based on the results, it is proposed that the true catalytic system is heterogeneous in nature.

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Vanadium-substituted Keggin heteropolycompounds as catalysts for ecofriendly liquid phase oxidation of 2,6-dimethylphenol to 2,6-dimethyl-1,4-benzoquinone

Cited by 69 publications

References 26 publications

Keggin heteropolycompounds as catalysts for liquid-phase oxidation of sulfides to sulfoxides/sulfones by hydrogen peroxide

Keggin heteropolycompounds as catalysts for liquid-phase oxidation of sulfides to sulfoxides/sulfones by hydrogen peroxide

Cu or Fe Modified Cs2HPMo12O40 as Catalysts for Selective Oxidation of Methacrolein

Selective Palladium‐Catalyzed Dehydrogenation of Limonene to Dimethylstyrene

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