Oxidation of benzene to phenol on supported Pt-VO  and Pd-VO  catalysts

Ehrich, Heike; Pohl, Marga‐Martina; Jähnisch, Klaus; Baerns, M.

doi:10.1016/s0926-860x(02)00040-6

Cited by 87 publications

(44 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Redox metals used were copper, [27 -32] titanium, [33] and vanadium. [34,35] Recently it has been shown that the combination of heterogeneous Pd and Pt catalysts with homogeneous catalysts accelerates the hydroxylation of benzene to phenol by oxygen and hydrogen. Using Pt/SiO 2 /V(acac) 3 catalysts in acetic acid, a phenol selectivity of 21.8% (based on oxygen) at an oxygen conversion of 3.1% could be obtained.…”

Section: Direct Hydroxylation Of Aromatic Compoundsmentioning

confidence: 99%

Oxidation and Ammoxidation of Aromatics

Lücke¹,

Narayana²,

Martin³

et al. 2004

Adv Synth Catal

131

View full text Add to dashboard Cite

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.

show abstract

Section: Direct Hydroxylation Of Aromatic Compoundsmentioning

confidence: 99%

Oxidation and Ammoxidation of Aromatics

Lücke¹,

Narayana²,

Martin³

et al. 2004

Adv Synth Catal

131

View full text Add to dashboard Cite

show abstract

“…The route to activate oxygen is necessary for the reaction. One of ways to generate the activated oxygen species is to reduce molecular oxygen by hydrogen in the process of a so-called ''reductive activation'' [17]. However, the process is often dangerous for the mixture of hydrogen and oxygen.…”

Section: Introductionmentioning

confidence: 99%

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

Gao

2006

Catal Lett

View full text Add to dashboard Cite

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.

show abstract

“…Phenol is an important intermediate for the manufacture of petrochemicals, agrochemicals and plastics [1][2][3]. It is mainly produced by cumene process.…”

Section: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract

Oxidation of benzene to phenol on supported Pt-VO and Pd-VO catalysts

Cited by 87 publications

References 16 publications

Oxidation and Ammoxidation of Aromatics

Oxidation and Ammoxidation of Aromatics

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

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

Contact Info

Product

Resources

About