A highly active Au/Al2O3 catalyst for cyclohexane oxidation using molecular oxygen

Xu, Lixin; He, Chao‐Hong; Fang, Sheng

doi:10.1007/s10562-007-9058-0

Cited by 101 publications

(67 citation statements)

References 30 publications

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“…The nano-structured Au@TiO 2 / MCM-22 (PR) exhibits extremely higher TOF than the reported gold catalysts [21] [39] [40]. Experiment results also show that the TOF become higher with a decrease in the amount of Au (Table 4).…”

Section: Catalytic Oxidation Of Cyclohexanementioning

confidence: 79%

“…Metal-oxide hybrid nanoparticles have been applied to cyclohexane oxidation in the literature. Zhu et al [21] The MCM-22, referring to Wang et al [24] using hexamethyleneimine (HMI) as template, was synthesized. A certain amount of MCM-22 (1.00 g) and 5 mL of tetrabutylammonium titanate (TBOT) were dissolved together in ethanol (15 mL), and the solution was stirred at 300 rpm at 293 K for 12 h. Then a small amount of HNO 3 was added under stirring.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Novel Complex Nano-Structured Gold Catalyst Au@TiO2/MCM-22, Characterization and Remarkably Catalytic Performance for Cyclohexane Oxidation

Li²,

Zhang

et al. 2017

MRC

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A novel complex nano-structured Au@TiO 2 gold catalyst has been prepared. Au precursor could be transformed into Au@TiO 2 /MCM-22 with the complex nano-structured using two different methods. Samples were characterized by XRD, FT-IR, UV-vis, TEM, ICP-AES and N 2 adsorption-desorption. It is found that gold was anchored on the TiO 2 /MCM-22 as small size and uniform particles with the average diameters in the range of 5 -9 nm. Catalytic results show that such nano-gold catalysts display excellent catalytic performance for cyclohexane oxidation. Au@TiO 2 /MCM-22 catalyst with the gold content of 0.5 wt% exhibits extremely exceptionally catalytic activity (12.81%) and high turnover frequency (52,121 h −1 ), which may be ascribed to the synergistic effects of Au and TiO 2 in the complex nano-structured catalyst Au@TiO 2 / MCM-22. Because of the strong metal support interaction, aggregation of active sites (Au nanoparticles) during the oxidation reaction is effectively prohibited and the catalytic activity is essentially retained.

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Section: Catalytic Oxidation Of Cyclohexanementioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Preparation of Novel Complex Nano-Structured Gold Catalyst Au@TiO2/MCM-22, Characterization and Remarkably Catalytic Performance for Cyclohexane Oxidation

Li²,

Zhang

et al. 2017

MRC

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“…However, in the reaction mechanism shown in (1) to (5), CyOOH must be produced as the starting material. Since the present process does not involve a radical initiator, CyOOH is expected to be produced by catalytic oxidation of CyH [18,19], so that CyOOH formation is the rate-determining step [20]. In fact, there is an induction period for about 3 h, then the activity increases almost linearly until 7 h, and finally, it saturates after longer than 7 h due to over-oxidation, as seen in Fig.…”

Section: Reaction Mechanismmentioning

confidence: 86%

Selective liquid phase oxidation of cyclohexane over Pt/CeO2-ZrO2-SnO2/SiO2 catalysts with molecular oxygen

2015

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Partial oxidation of cyclohexane into cyclohexanone and cyclohexanol (KA-oil) is an industrially significant reaction for producing precursors for the synthesis of ε-caprolactam and adipic acid, which are the building blocks of nylon. However, to date, the cyclohexane conversion ratio has usually been limited to less than 6% to prevent further oxidation of the cyclohexanol and cyclohexanone targets. In this study, we report that Pt/CeO 2 -ZrO 2 -SnO 2 /SiO 2 , in which CeO 2 -ZrO 2 -SnO 2 provide reactive oxygen molecules from inside the bulk, can act as efficient catalysts. Optimization of the catalyst composition and reaction conditions provided a cyclohexane conversion ratio of 24.1% and a total selectivity for cyclohexanol and cyclohexanone of 83.4% at 130 ℃ in 0.5 MPa (4.9 atm) air for 7 h over a 5wt%Pt/16wt%Ce 0.68 Zr 0.17 Sn 0.15 O 2.0 /SiO 2 catalyst. This catalyst has significant advantages over conventional catalysts because the reaction proceeds at a lower pressure, and there is no need for toxic radical initiators or free-radical scavengers.

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“…-clusters were introduced. A wide variety of supported gold catalysts have been reported to exhibit great performance in selective liquid phase cyclohexane oxidation [47][48][49]. Inspired by the promising results reported on selective oxidation of cyclohexane over gold-based catalyst materials [49], in this publication we have investigated the potential application of supported gold catalysts for the selective oxidation of methane into methanol.…”

Section: Introductionmentioning

confidence: 99%

An Attempt to Selectively Oxidize Methane over Supported Gold Catalysts

Hereijgers

Weckhuysen

2011

Catal Lett

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The potential of supported gold catalysts for the selective gas-phase oxidation of methane to methanol with molecular oxygen was investigated. A broad range of supported gold-based catalyst materials was synthesized using reducible and non-reducible support materials. Although the formation of small gold nanoparticles was established for all catalyst materials, only a very low activity for the total oxidation of methane was observed, at temperatures [250°C. Since no traces of partial oxidation products, such as methanol, formaldehyde, formic acid, methyl formate, dimethyl ether and CO, were observed it was concluded that supported gold catalysts are not able to selectively oxidize methane to methanol under these experimental conditions.

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A highly active Au/Al2O3 catalyst for cyclohexane oxidation using molecular oxygen

Cited by 101 publications

References 30 publications

Preparation of Novel Complex Nano-Structured Gold Catalyst Au@T<sub>i</sub>O<sub>2</sub>/MCM-22, Characterization and Remarkably Catalytic Performance for Cyclohexane Oxidation

Preparation of Novel Complex Nano-Structured Gold Catalyst Au@T<sub>i</sub>O<sub>2</sub>/MCM-22, Characterization and Remarkably Catalytic Performance for Cyclohexane Oxidation

Selective liquid phase oxidation of cyclohexane over Pt/CeO2-ZrO2-SnO2/SiO2 catalysts with molecular oxygen

An Attempt to Selectively Oxidize Methane over Supported Gold Catalysts

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A highly active Au/Al2O3 catalyst for cyclohexane oxidation using molecular oxygen

Cited by 101 publications

References 30 publications

Preparation of Novel Complex Nano-Structured Gold Catalyst Au@T&lt;sub&gt;i&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt;/MCM-22, Characterization and Remarkably Catalytic Performance for Cyclohexane Oxidation

Preparation of Novel Complex Nano-Structured Gold Catalyst Au@T&lt;sub&gt;i&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt;/MCM-22, Characterization and Remarkably Catalytic Performance for Cyclohexane Oxidation

Selective liquid phase oxidation of cyclohexane over Pt/CeO2-ZrO2-SnO2/SiO2 catalysts with molecular oxygen

An Attempt to Selectively Oxidize Methane over Supported Gold Catalysts

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Preparation of Novel Complex Nano-Structured Gold Catalyst Au@T<sub>i</sub>O<sub>2</sub>/MCM-22, Characterization and Remarkably Catalytic Performance for Cyclohexane Oxidation

Preparation of Novel Complex Nano-Structured Gold Catalyst Au@T<sub>i</sub>O<sub>2</sub>/MCM-22, Characterization and Remarkably Catalytic Performance for Cyclohexane Oxidation