Gas Phase Oxidation of Benzene to Phenol under the Simultaneous Feeding of Hydrogen and Oxygen. III. Catalyst Prepared from Cu(II) Phosphate

Kitano, Tomoyuki; Nakai, Toshihiro; Nitta, Masahiro; Mori, Miki; Ito, Sotaro; Sasaki, Kazuo

doi:10.1246/bcsj.67.2850

Cited by 26 publications

(7 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The investigations of direct oxidation of benzene to phenol with various oxidants, such as nitrous oxide [2][3][4], hydrogen peroxide [5][6][7], molecular oxygen [8], or a mixture of oxygen and hydrogen [9][10][11] have been reported. The direct hydroxylation of benzene with molecular oxygen seems to be more potential for industrial application, which proceeds in a green process.…”

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

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

show abstract

“…[9][10][11][12] The direct oxidation of benzene to phenol by molecular oxygen catalyzed by palladium acetate was reported in the presence of molybdovanadophosphoric HPAs as a reoxidant for palladium. 13,14 The gas-or liquid-phase catalytic oxidations of benzene to phenol over supported Cu-Pd composite, 15,16 Pt, 17 Pd membrane, 18 and vanadium 19 catalysts were reported using both molecular oxygen and the reducing gas, H 2 . More recently, the liquid-phase oxidation of benzene to phenol catalyzed by molybdovanadophosphoric HPAs was reported using air as an oxidant and carbon monoxide as a reducing reagent.…”

Section: Introductionmentioning

confidence: 99%

Zinc Powder as an Effective Reducing Reagent during Liquid-Phase Oxidation of Benzene to Phenol Using Molecular Oxygen over V-Substituted Heteropoly Acid Catalysts

Sumimoto

Tanaka

Yamaguchi

et al. 2006

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The liquid-phase oxidation of benzene to phenol in an aqueous acetic acid solvent over a V-substituted heteropolyacid catalyst was attempted using zinc powder as the reducing reagent and gaseous oxygen as the oxidant. Phenol, an oxygenation product, was selectively obtained. Zinc powder, together with the use of gaseous oxygen as the oxidant, was found to be an effective reducing reagent for phenol formation. The influences of the phenol yield on the reaction temperature, the amount of zinc powder, the concentration of acetic acid, and the amount of the V-substituted heteropolyacid catalyst were investigated. The yield of phenol had a maximum value using an aqueous solvent of acetic acid of about 60 vol %. The reuse of the used V-substituted heteropolyacid catalyst caused a decrease in the phenol yield. The reduction of part of the V species in the used V-substituted heteropolyacid catalyst was suggested to be a cause of the deactivation of the phenol formation based on the observation of the diffuse reflectance spectra of the fresh and used catalysts. The generation of hydrogen peroxide (H2O2) was confirmed in the aqueous acetic acid solvent in the presence of both zinc powder and gaseous oxygen. The dependence of the amount of generated H2O2 on the concentration of acetic acid in the aqueous solvent was found to be fairly well correlated with that of the yield of phenol on the concentration of acetic acid.

show abstract

“…Sasaki and co-workers have demonstrated the benzene oxidation to phenol with high selectivity in the presence of both O 2 and H 2 over a supported Cu-Pd binary catalyst. 22,23 However, the use of a mixture of H 2 and O 2 have the risk of explosion. Molecular oxygen is economically favorable as an oxidant because it is easy to handle and readily available.…”

Section: Introductionmentioning

confidence: 99%

One-step gas-phase catalytic oxidation of benzene to phenol with molecular oxygen over Cu-supported ZSM-5 zeolites

Hamada

Shibata

Nishiyama

et al. 2003

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

The gas-phase catalytic oxidation of benzene was carried out using molecular oxygen as an oxidant over Cu-supported catalysts. Phenol was formed only when using Cu-supported high-silica-type zeolites as catalysts. The Cu-supported H-ZSM-5 zeolite (CuH-ZSM-5) was the most active among those tested. Deep oxidation products (CO and CO 2 ) were also produced together with phenol and they were suggested to form either via phenol or directly from benzene, based on the activity test experiments by varying the contact time. The yield and selectivity of phenol had a maximum with respect to the Cu contents in the CuH-ZSM-5, and were optimized with ca. a 0.77 wt.% Cu loading (phenol yield $4.9%). The calcination of the CuH-ZSM-5 at the higher temperature of around 1123 K was found to be effective for the phenol formation. The H-ZSM-5 with lower Si/Al atomic ratios was an effective support for the phenol formation. The EPR study revealed that the increase in the square-pyramidal Cu 2+ species was brought about when the CuH-ZSM-5 was calcined at higher temperatures or when HZSM-5 with lower Si/Al atomic ratios was used as a support. The isolated squarepyramidal Cu 2+ species was suggested to be the active species for the phenol formation.

show abstract

Gas Phase Oxidation of Benzene to Phenol under the Simultaneous Feeding of Hydrogen and Oxygen. III. Catalyst Prepared from Cu(II) Phosphate

Cited by 26 publications

References 6 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

Zinc Powder as an Effective Reducing Reagent during Liquid-Phase Oxidation of Benzene to Phenol Using Molecular Oxygen over V-Substituted Heteropoly Acid Catalysts

One-step gas-phase catalytic oxidation of benzene to phenol with molecular oxygen over Cu-supported ZSM-5 zeolites

Contact Info

Product

Resources

About