Catalytic oxidation of cyclohexane to cyclohexanol and cyclohexanone over Co3O4 nanocrystals with molecular oxygen

Zhou, Lipeng; Xu, Jie; Miao, Hong; Wang, Feng; Li, Xiaoqiang

doi:10.1016/j.apcata.2005.06.018

Cited by 168 publications

(105 citation statements)

References 27 publications

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“…Therefore the active outer sphere of Co-300 was mechanically removed and the resulting powder was used for the FTIR study. Co 3 O 4 is known to show two absorption bands with medium amplitude at specific positions (~550 and 650 cm -1 ) due to stretching vibration of the metal-O bond 54,55,56 . Indeed, these absorption bands can be clearly seen in our spectrum ( Figure S3) indicating that Co is octahedral surrounded by oxygen.…”

mentioning

confidence: 99%

X20CoCrWMo10-9//Co₃O₄: a metal–ceramic composite with unique efficiency values for water-splitting in the neutral regime

Schäfer

Chevrier

Kuepper

et al. 2016

Energy Environ. Sci.

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In spite of the drastic oil price collapse in the second half of 2014 resulting in a price below 30 $/barrel in January 2016 1 , the exploration of promising renewable energy sources for the Abstract: Water splitting allows the storage of solar energy into chemical bonds (H 2 +O 2 ) and will help to implement the urgently needed replacement of limited available fossil fuels. Particularly in neutral environment electrochemically initiated water splitting suffers from low efficiency due to high overpotentials (η) caused by the anode. Electro-activation of X20CoCrWMo10-9, a Co-based tool steel resulted in a new composite material (X20CoCrWMo10-9//Co 3 O 4 ) that catalyzes the anode half-cell reaction of water electrolysis with a so far-, unequalled effectiveness. The current density achieved with this new anode in pH 7 corrected 0.1 M phosphate buffer is over a wide range of η around 10 times higher compared to recently developed, up-to-date electrocatalysts and represents the benchmark performance advanced catalysts show in regimes that support water splitting significantly better than pH 7 medium. X20CoCrWMo10-9//Co 3 O 4 exhibited electrocatalyticproperties not only at pH 7, but also at pH 13, which is much superior to the ones of IrO 2 -RuO 2 , single-phase Co 3 O 4 -or Fe/Ni-based catalysts. Both XPS and FT-IR experiments unmasked Co 3 O 4 as the dominating compound on the surface of the X20CoCrWMo10-9//Co 3 O 4 composite. Upon a comprehensive dual beam FIB-SEM (focused ion beam-scanning electron microscopy) study we could show that the new composite does not exhibit a classical substrate-layer structure due to the intrinsic formation of the Co-enriched outer zone. This structural particularity is basically responsible for the outstanding electrocatalytic OER performance.2 future is one of the significant challenges for scientists and engineers concerned with energy issues research. Splitting of water into hydrogen and oxygen by exploiting solar energy transforms water to an inexhaustible and environmental friendly fuel source 2,3,4,5,6,7,8,9 .Electrocatalytically initiated hydrogen-and oxygen formation from water is considered an important realization of this solar to fuel conversion route 10,11,12 but is typically hampered by the high overpotentials oxygen evolution on the anode side goes with 13,14 . This is particularly true when the electrochemical cleavage of more or less untreated water is intended-; hence, when the splitting procedure is carried out at neutral pH value. 17,18,19,20,21,22,23,24 . Scheme 1 gives some idea of the position of current heterogeneous catalysts in terms of their efficiency regarding OER in neutral regime. The significant improvement of the voltage-current behavior can be taken from both-, the non-steady state ( Figure 1a) as well as the steady state polarization (Figure 1b) experiments. Results OER properties in neutral mediumThe CV of sample Co-300 shows along the entire curve substantially stronger current to voltage ratio than the CV of sample Co and reached, at the upper...

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confidence: 99%

X20CoCrWMo10-9//Co₃O₄: a metal–ceramic composite with unique efficiency values for water-splitting in the neutral regime

Schäfer

Chevrier

Kuepper

et al. 2016

Energy Environ. Sci.

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“…The selectivity of 2-cyclohexen-1-one dropped slightly from 61.4% to 58.2% while the conversion of cyclohexene increased about 50%. In general, the conversion and selectivity of an oxidation reaction change with the opposite trends where the selectivity decreased with the increase of the conversion [43]. Therefore, the selectivity of 2-cyclohexen-1-one decreased when the conversion of cyclohexene increased.…”

Section: Catalytic Performance Of Meapo-5-meso (Me = Mn Fe and Co) Imentioning

confidence: 99%

Synthesis of hierarchical MeAPO-5 molecular sieves – Catalysts for the oxidation of hydrocarbons with efficient mass transport

Zhou

et al. 2012

Microporous and Mesoporous Materials

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“…Other researchers reported that a free-radical initiator (for example, TBHP) can improve the catalytic activity of the catalyst by accelerating the auto-oxidation process at the initiation stage using O 2 oxidant [34]. Here, the effect of TBHP on the oxidation reaction over the 0.2%Co/MgO catalyst was also examined.…”

Section: Introductionmentioning

confidence: 98%

Catalytic Performance of MgO-Supported Co Catalyst for the Liquid Phase Oxidation of Cyclohexane with Molecular Oxygen

Wang

et al. 2017

Catalysts

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Abstract:A highly-efficient and stable MgO-supported Co (Co/MgO) catalyst was developed for the oxidation of cyclohexane with oxygen. The effects of the Co loading and support on the catalytic activity of the supported Co 3 O 4 catalyst were investigated. The results show that the Co supported on MgO presented excellent activity and stability. When the Co/MgO catalyst with the Co content of 0.2 wt % (0.2%Co/MgO) was used, 12.5% cyclohexane conversion and 74.7% selectivity to cyclohexanone and cyclohexanol (KA oil) were achieved under the reaction conditions of 0.5 MPa O 2 and 140 • C for 4 h. After being repeatedly used 10 times, its catalytic activity was hardly changed. Further research showed that the high catalytic performance of the 0.2%Co/MgO catalyst is attributed to its high oxygen-absorbing ability and the high ratio between the amount of weak and medium base sites with the help of the synergistic interaction between Co and MgO.

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Catalytic oxidation of cyclohexane to cyclohexanol and cyclohexanone over Co3O4 nanocrystals with molecular oxygen

Cited by 168 publications

References 27 publications

X20CoCrWMo10-9//Co₃O₄: a metal–ceramic composite with unique efficiency values for water-splitting in the neutral regime

X20CoCrWMo10-9//Co₃O₄: a metal–ceramic composite with unique efficiency values for water-splitting in the neutral regime

Synthesis of hierarchical MeAPO-5 molecular sieves – Catalysts for the oxidation of hydrocarbons with efficient mass transport

Catalytic Performance of MgO-Supported Co Catalyst for the Liquid Phase Oxidation of Cyclohexane with Molecular Oxygen

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Catalytic oxidation of cyclohexane to cyclohexanol and cyclohexanone over Co3O4 nanocrystals with molecular oxygen

Cited by 168 publications

References 27 publications

X20CoCrWMo10-9//Co3O4: a metal–ceramic composite with unique efficiency values for water-splitting in the neutral regime

X20CoCrWMo10-9//Co3O4: a metal–ceramic composite with unique efficiency values for water-splitting in the neutral regime

Synthesis of hierarchical MeAPO-5 molecular sieves – Catalysts for the oxidation of hydrocarbons with efficient mass transport

Catalytic Performance of MgO-Supported Co Catalyst for the Liquid Phase Oxidation of Cyclohexane with Molecular Oxygen

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X20CoCrWMo10-9//Co₃O₄: a metal–ceramic composite with unique efficiency values for water-splitting in the neutral regime

X20CoCrWMo10-9//Co₃O₄: a metal–ceramic composite with unique efficiency values for water-splitting in the neutral regime