Liquid-phase oxidation of benzene to phenol by vanadium catalysts in aqueous solvent with high acetic acid concentration

Masumoto, Yu-ki; Hamada, Rei; Yokota, Kumiko; Nishiyama, Satoru; Tsuruya, Shigeru

doi:10.1016/s1381-1169(01)00528-3

Cited by 72 publications

(41 citation statements)

References 9 publications

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“…Figure 6 shows that the yield of phenol increases with increasing concentration of acetic acid over 6.21 V-HMS catalyst at 60°C. This may suggest that H 2 O 2 in the higher concentrations of acetic acid solvent is utilized efficiently for the formation of phenol, in agreement with the results reported previously [24].…”

Section: Catalytic Testsupporting

confidence: 92%

Synthesis and Characterization of V-HMS Employed for Catalytic Hydroxylation of Benzene

et al. 2009

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V-HMS catalysts with different vanadium content have been prepared by co-synthesis method using dodecylamine as template. The isolated VO 4 species are successfully incorporated into the framework of HMS for the samples with low vanadium content. The effect of various reaction conditions on the hydroxylation of benzene to phenol with H 2 O 2 as oxidant in aqueous acetic acid solvent was investigated where the yield of phenol achieves 11.1% under the optimized condition.

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Section: Catalytic Testsupporting

confidence: 92%

Synthesis and Characterization of V-HMS Employed for Catalytic Hydroxylation of Benzene

et al. 2009

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“…[25] The highest phenol yield amounted to about 9% when V/Al 2 O 3 catalysts are used in 80% acetic acid for the hydroxylation with oxygen as oxidant and ascorbic acid as reductant. [26] A drawback of this process is that vanadium penetrates into the liquid phase by leaching. The use of other reductants such as hydroquinone, pyrocatechol, dithiothreitol, or 2-mercaptoethanol resulted in considerably lower yields of phenol.…”

Section: Direct Hydroxylation Of Aromatic Compoundsmentioning

confidence: 99%

Oxidation and Ammoxidation of Aromatics

Lücke¹,

Narayana²,

Martin³

et al. 2004

Adv Synth Catal

131

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An overview of the state of the art in the direct oxygen or nitrogen insertion to aromatic rings and side-chains by hydroxylation, acetoxylation, partial oxidation and ammoxidation is presented. The influence of a variety of catalysts and oxidants on the yields of hydroxylated products of aromatic species is discussed in more detail. The survey is also focussed on the usage of H 2 O 2 as an effective oxidising agent for hydroxylation reactions. Acetoxylation of methyl-substituted aromatic compounds to their corresponding esters in a single step is indeed an interesting area from an industrial point of view. Hence, the topics covering benzylic acetoxylation, although they are under a developmental stage for commercial exploitation, are also reviewed. The present contribution also covers the main directions of selective oxidation/ammoxidation of aromatic compounds to useful products, surveys recent developments and provides an updated discussion of the state of the art in the field of oxidation and ammoxidation of aromatics. Additionally, a comparative study of the vapour phase oxidation and ammoxidation of different alkyl aromatics to their corresponding aldehydes and nitriles using various heterogeneous catalysts is presented.Besides, the achievements and limitations of the catalysts/processes are emphasised. Furthermore, the present article includes a discussion of common features and differences in mechanistic steps of oxidation and ammoxidation reactions investigated by in situ FITR spectroscopy. The influence of acid-base properties of catalyst surfaces in connection with electronic effects of the substituents on the performance of the catalysts is also described.

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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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Liquid-phase oxidation of benzene to phenol by vanadium catalysts in aqueous solvent with high acetic acid concentration

Cited by 72 publications

References 9 publications

Synthesis and Characterization of V-HMS Employed for Catalytic Hydroxylation of Benzene

Synthesis and Characterization of V-HMS Employed for Catalytic Hydroxylation of Benzene

Oxidation and Ammoxidation of Aromatics

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

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