Liquid-phase oxygenation of benzene over supported vanadium catalysts

Ishida, Masa-aki; Masumoto, Yu-ki; Hamada, Rei; Nishiyama, Satoru; Tsuruya, Shigeru; Masai, Mitsuo

doi:10.1039/a808115h

Cited by 48 publications

(36 citation statements)

References 7 publications

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“…Vanadium is a widely used as an active element in several industrial catalysts [12], especially for oxidation reaction. Many efforts have been done to study the direct oxidation of benzene to phenol based on vanadium-contain catalysts [13][14], and the catalysts show good catalytic behavior in the reaction.…”

Section: Introductionmentioning

confidence: 99%

The oxygen activated by the active vanadium species for the selective oxidation of benzene to phenol

Gao

2006

Catal Lett

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The activation of oxygen is a key step for the selective oxidation of benzene to phenol and the reason is discussed. The active oxygen species is produced from molecular oxygen in a so-called ''reductive activation'' process. The vanadium oxide supported on alumina was pre-reduced by hydrogen or ascorbic acid to lower valence vanadium species acting as reduction source and the activity is investigated in the reaction. It is found that the V 4+ valence vanadium (VO 2+ ) is effective for the reaction from the characterization of catalysts by XPS.

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Section: Introductionmentioning

confidence: 99%

The oxygen activated by the active vanadium species for the selective oxidation of benzene to phenol

Gao

2006

Catal Lett

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“…C 24 . An irregular blue crystal was selected from the crystalline sample of complex 1 under polarized light and fixed at the end of a glass fiber for X-ray analysis.…”

Section: X-ray Crystallographymentioning

confidence: 99%

“…The direct synthesis of phenol from benzene is of the greatest interest to chemical industry, and the findings of other new catalytic systems have been reported but not industrialized yet. [23][24][25] , and using CH 3 CN as solvent.…”

Section: Catalytic Testsmentioning

confidence: 99%

Synthesis, characterization and benzene oxidation promoted by a new mononuclear copper(II) complex, [Cu(BTMEA)2Cl]Cl

Esmelindro

Oestreicher

Caovilla

et al. 2006

J. Braz. Chem. Soc.

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O objetivo deste trabalho é apresentar a síntese, estrutura cristalina, atividade eletroquímica, propriedades espectroscópicas (IV-TF e UV-Vis) e atividade catalítica frente à oxidação do benzeno do novo complexo mononuclear de cobre ( I redox couple and with a coupled reaction involving the chloride ligand. The catalytic activity of 1 was evaluated through benzene oxidation reaction, using hydrogen peroxide as oxidant. Reaction products (phenol and pbenzoquinone) were identified by gas chromatography.

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“…The yield of phenol increased with increasing amount of ascorbic acid up to 0.400 g, but a further increase in the amount of ascorbic acid inversely caused a decrease in the yield of phenol. The role of the reducing reagent was suggested to activate the oxygen molecule through the reduction of the V species, however, an extra ascorbic acid may decrease the activated oxygen species as well as [37]. The yield of phenol had a maximum value at the amount of ascorbic acid of around 0.400 g. The activated oxygen species are necessity for phenol formation, without utilizing for the benzene oxidation and thus the extra ascorbic acid is not in favor of the increase in phenol yield.…”

Section: Effect Of the Amount Of Ascorbic Acid On The Yield Of Phenolmentioning

confidence: 98%

Direct Hydroxylation of Benzene to Phenol with Molecular Oxygen over Phase Transfer Catalysts: Cyclodextrins Complexes with Vanadium-Substituted Heteropoly Acids

Leng

Zhou

et al. 2008

Catal Lett

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Cyclodextrins (CyDs) complexes with vanadium-substituted heteropoly acids (PMoV n -b-CyDs, n = 1, 2) were prepared by simple mixing and their structures were characterized by FT-IR. Among various catalysts, PMoV 1 -b-CyDs, an efficient phase transfer catalyst, exhibited the highest yield (13.1%) of phenol without observing the formation of catechol, hydroquinone and benzoquinone in direct hydroxylation of benzene to phenol in 80 vol% aqueous acetic acid with molecular oxygen and ascorbic acid used as the oxidant and the reducing reagent, respectively. The influences of the reaction temperature, the pressure of oxygen, the amount of ascorbic acid, the amount of catalyst, and the reaction time on the yield of phenol were investigated to obtain the optimal reaction conditions for phenol formation.

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Liquid-phase oxygenation of benzene over supported vanadium catalysts

Cited by 48 publications

References 7 publications

The oxygen activated by the active vanadium species for the selective oxidation of benzene to phenol

The oxygen activated by the active vanadium species for the selective oxidation of benzene to phenol

Synthesis, characterization and benzene oxidation promoted by a new mononuclear copper(II) complex, [Cu(BTMEA)2Cl]Cl

Direct Hydroxylation of Benzene to Phenol with Molecular Oxygen over Phase Transfer Catalysts: Cyclodextrins Complexes with Vanadium-Substituted Heteropoly Acids

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