Effects of oxidant and solvent on the liquid-phase cyclohexane oxidation catalyzed by Ce-exchanged zeolite Y

Pires, Emerson Luis; Magalhães, João C; Schuchardt, Ulf

doi:10.1016/s0926-860x(00)00496-8

Cited by 71 publications

(30 citation statements)

References 15 publications

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“…6 shows that acetone and acetonitrile are favorable solvents for the oxidation of cyclohexane, whereas 1,2-dichloroethane and carbon tetrachloride as solvents led to a cyclohexane conversion of 0.05% and 0.8%, respectively. This is contrary to the liquid-phase oxidation of cyclohexane with tert-butylhydroperoxide over Ce-exchanged zeolite Y [6]. This shows that basic and aprotic acetonitrile as a solvent not only favored the production of cyclohexanone but also showed a higher activity, while the polar solvent methanol gave a low cyclohexane conversion as a result of strong hydrophilicity of transition metal ion-substituted aluminophosphates [42].…”

Section: Catalyst Testingmentioning

confidence: 98%

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Synthesis, characterization and catalysis of (Co, V)-, (Co, Cr)- and (Cr, V)APO-5 molecular sieves

Fan

Song

et al. 2006

Microporous and Mesoporous Materials

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Synthesis, characterization and catalysis of (Co, V)-, (Co, Cr)-and (Cr, V)APO-5 molecular sieves ) molecular sieves have been hydrothermally synthesized and characterized. The as-synthesized and calcined samples were investigated with XRD, ICP, DRS UV-vis spectroscopy, ESR, 27 Al MAS NMR techniques to explore the valence, coordination and location of the incorporated transition metal ions. It was shown that isomorphous substitution of Co 2+ for Al 3+ convincingly occurred, and V 4+ also anchored to the sample by coordinating to two framework oxygen atoms and most probably occupying P 5+ sites, while no unambiguous spectroscopic evidence was provided for the incorporation of Cr 3+ in the lattice, although chemical analysis suggests this possibility in the case that Co 2+ or V 4+ are added to the synthesis gel. The preferential sequence for the incorporation of these transition metal ions in the AFI framework is: Co 2+ > V 4+ > Cr 3+ . After calcination, almost all V 4+ ions were oxidized to V 5+ , whereas Cr 3+ ions were oxidized to Cr 5+ and Cr 6+ . As catalysts, the (M, N)APO-5 molecular sieves are highly active for the selective oxidation of cyclohexane with a high cyclohexanone/cyclohexanol ratio in the presence of H 2 O 2 . The reaction temperature and solvent significantly influenced the catalytic behavior. Although some leaching of the transition metal ions was observed, the catalytic performance remained stable at least within five repeated runs.

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Section: Catalyst Testingmentioning

confidence: 98%

“…Corp.). Except as specified, the reaction was carried out at 60°C in a 50-mL sealed stainless steel autoclave for 40 h. A typical batch is as follows: 18.5 mmol of C 6 4 , P99.5%, Beijing Chem. Corp.)).…”

Section: Catalyst Testingmentioning

confidence: 99%

Synthesis, characterization and catalysis of (Co, V)-, (Co, Cr)- and (Cr, V)APO-5 molecular sieves

Fan

Song

et al. 2006

Microporous and Mesoporous Materials

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“…The reaction was studied using two different oxidants: tert-butyl hydroperoxide (TBHP) and hydrogen peroxide (H 2 O 2 ). [22] The molar ratio of reagent to oxidant was kept to 1:1. The results are summarised in Table 3.…”

Section: Catalytic Testingmentioning

confidence: 99%

“…[21] The reason behind the choice of cyclohexene as the test molecule is the volume of data that exists in the literature, which allows for the appropriate choice of reaction conditions. [22] The oxidation of cyclohexene has been utilised as a model reaction in selective oxidation studies. [23][24][25] Two common liquid phase oxidants were employed: hydrogen peroxide (H 2 O 2 ) and tert-butyl hydroperoxide (TBHP).…”

Section: Introductionmentioning

confidence: 99%

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Selective oxidation of cyclohexene through gold functionalized silica monolith microreactors

et al. 2016

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders. were found to be catalytically inactive with Au being the minimum necessary requirement for the reaction to proceed. The impregnated Au-containing monolith was found to be less active than the thiol functionalized Au-containing material, attributable to the low metal surface area of the Au nanoparticles. The reaction on the thiol functionalized Au-containing monolith was found to depend strongly on the type of oxidant used: tert-butyl hydroperoxide (TBHP) was more active than H 2 O 2, likely due to the thiol induced hydrophobicity in the monolith.

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There's Plenty of Room in the Field of Zeolite‐Y Enslaved Nanohybrid Materials as Eco‐Friendly Catalysts: Selected Catalytic Reactions

Modi¹,

Trivedi²

2014

Advanced Energy Materials

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Effects of oxidant and solvent on the liquid-phase cyclohexane oxidation catalyzed by Ce-exchanged zeolite Y

Cited by 71 publications

References 15 publications

Synthesis, characterization and catalysis of (Co, V)-, (Co, Cr)- and (Cr, V)APO-5 molecular sieves

Synthesis, characterization and catalysis of (Co, V)-, (Co, Cr)- and (Cr, V)APO-5 molecular sieves

Selective oxidation of cyclohexene through gold functionalized silica monolith microreactors

There's Plenty of Room in the Field of Zeolite‐Y Enslaved Nanohybrid Materials as Eco‐Friendly Catalysts: Selected Catalytic Reactions

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