Confined Iron Nanowires Enhance the Catalytic Activity of Carbon Nanotubes in the Aerobic Oxidation of Cyclohexane

Yang, Xixian; Yu, Hao; Peng, Feng; Wang, Hongjuan

doi:10.1002/cssc.201100807

Cited by 60 publications

(45 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Furthermore, the impregnation and sol immobilisation catalysts supported on graphene both appear to give higher conversions than the graphite supported analogues. This may be due to some stabilising effect of the graphene sheets on the cyclohexenyl radical as observed by Yang et al in the aerobic oxidation of cyclohexane, thereby increasing the rate of the autocatalytic reaction [32]. In addition, the Au/graphene catalysts consistently provided higher selectivities for the allylic oxidation products in comparison with the Au/graphite catalysts.…”

Section: Resultsmentioning

confidence: 77%

The Low Temperature Solvent-Free Aerobic Oxidation of Cyclohexene to Cyclohexane Diol over Highly Active Au/Graphite and Au/Graphene Catalysts

et al. 2018

View full text Add to dashboard Cite

Abstract:The selectivity and activity of gold-catalysts supported on graphite and graphene have been compared in the oxidation of cyclohexene. These catalysts were prepared via impregnation and sol immobilisation methods, and tested using solventless and radical initiator-free reaction conditions. The selectivity of these catalysts has been directed towards cyclohexene epoxide using WO 3 as a co-catalyst and further to cyclohexane diol by the addition of water, achieving a maximum selectivity of 17% to the diol. The sol immobilisation catalysts were more reproducible and far more active, however, selectivity towards the diol was lower than for the impregnation catalyst. The results suggest that formation of cyclohexane diol through solventless oxidation of cyclohexene is limited by a number of factors, such as the formation of an allylic hydroperoxyl species as well as the amount of in situ generated water.

show abstract

Section: Resultsmentioning

confidence: 77%

The Low Temperature Solvent-Free Aerobic Oxidation of Cyclohexene to Cyclohexane Diol over Highly Active Au/Graphite and Au/Graphene Catalysts

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The tight packing of Ni nanowires in the inner surface of MWCNTs and its strong interaction with the graphitic shells facilitated the continuous and rapid electron transfer from metal to the graphitic walls. The theoretical studies on CNTs specified that the interaction of metal clusters with the internal surface of MWCNTs provided the stronger positive electrostatic environment and transferred number of electrons to the graphitic walls with the high electron density on MWCNTs surfaces in comparison with the exterior interaction of metal clusters with MWCNTs57. The encased metal nanoparticles activated the surrounding graphitic layers, leading to the alteration in the electronic structure and reduced the surface work function of graphitic layers, consequently the electrocatalytic activity of graphitic walls was enhanced.…”

Section: Discussionmentioning

confidence: 99%

Ni-Co bimetal nanowires filled multiwalled carbon nanotubes for the highly sensitive and selective non-enzymatic glucose sensor applications

Ramachandran

kumar

Babu

et al. 2016

Sci Rep

150

View full text Add to dashboard Cite

The facile, time and cost efficient and environmental benign approach has been developed for the preparation of Nickel (Ni)-Cobalt (Co) alloy nanowires filled multiwalled carbon nanotubes (MWCNTs) with the aid of mesoporous silica nanoparticles (MSN)/Ni-Co catalyst. The controlled incorporation of Ni-Co nanostructures in the three dimensional (3D) pore structures of MSN yielded the catalytically active system for the MWCNT growth. The inner surface of MWCNTs was quasi-continuously filled with face-centered cubic (fcc) structured Ni-Co nanowires. The as-prepared nanostructures were exploited as non-enzymatic electrochemical sensor probes for the reliable detection of glucose. The electrochemical measurements illustrated that the fabricated sensor exhibited an excellent electrochemical performance toward glucose oxidation with a high sensitivity of 0.695 mA mM−1 cm−2, low detection limit of 1.2 μM, a wide linear range from 5 μM–10 mM and good selectivity. The unprecedented electrochemical performances obtained for the prepared nanocomposite are purely attributed to the synergistic effects of Ni-Co nanowires and MWCNTs. The constructed facile, selective and sensitive glucose sensor has also endowed its reliability in analyzing the human serum samples, which wide opened the new findings for exploring the novel nanostructures based glucose sensor devices with affordable cost and good stability.

show abstract

“…Even without the use of radical initiators and free-radical scavengers, the results for both conversion and selectivity are excellent. In particular, the reaction pressure (0.5 MPa or 4.9 atm) employed in the catalytic system is significantly lower than that used with conventional methods (1-1.5 MPa or 9.9-14.8 atm) [4][5][6][7][8][9]. The highest activity is obtained for Pt(5)/CZS/SiO 2 , for which a conversion ratio of 24.1% and a selectivity of 83.4% for KA-oil are achieved.…”

Section: Catalytic Performancementioning

confidence: 96%

“…The Cr-MIL-101/TBHP system produces KA-oil with 92% selectivity at a 25% CyH conversion ratio, while Fe-MIL-101/TBHP/O 2 gives a mixture of cyclohexyl hydroperoxide, K, and A with 99% total selectivity (49% selectivity for KA-oil) and a 38% conversion ratio at 70 ℃ in air (1 atm) for 8 h. However, the addition of TBHP is also essential in these reactions. Fe-filled carbon nanotubes are also active catalysts that have yielded a CyH conversion ratio of about 37% at 125 ℃ and 1.5 MPa (14.8 atm) O 2 for 8 h, although the selectivity to KA-oil was about 30% due to over-oxidation [9].…”

Section: Introductionmentioning

confidence: 99%

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

2015

View full text Add to dashboard Cite

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.

show abstract

Confined Iron Nanowires Enhance the Catalytic Activity of Carbon Nanotubes in the Aerobic Oxidation of Cyclohexane

Cited by 60 publications

References 46 publications

The Low Temperature Solvent-Free Aerobic Oxidation of Cyclohexene to Cyclohexane Diol over Highly Active Au/Graphite and Au/Graphene Catalysts

The Low Temperature Solvent-Free Aerobic Oxidation of Cyclohexene to Cyclohexane Diol over Highly Active Au/Graphite and Au/Graphene Catalysts

Ni-Co bimetal nanowires filled multiwalled carbon nanotubes for the highly sensitive and selective non-enzymatic glucose sensor applications

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

Contact Info

Product

Resources

About