Oxidation mechanism and valence states of copper and manganese in tetragonal CuMn2O4

Gillot, B.; Buguet, S.; Kester, E.

doi:10.1039/a703731g

Cited by 42 publications

(23 citation statements)

References 17 publications

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“…The peaks at 504 and 478 cm )1 were attributed to the absorption of the Cu-O in the spinel structure. The spectrum of Cu1Mn1-500 was very close to that shown in reference [28,29] for octahedral Cu 1.5 Mn 1.5 O 4 phase. The spectra of Cu1Mn1-600 and Cu1Mn1-700 samples were similar to that of Cu1Mn1-500.…”

Section: Fourier Transform Infrared (Ft-ir)supporting

confidence: 64%

Liquid-phase oxidation of toluene by molecular oxygen over copper manganese oxides

Zhou

et al. 2006

Catal Lett

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Copper manganese oxides (Cu-Mn oxides) were prepared by coprecipitation method and characterized by several techniques, such as X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Temperature-programmed reduction (TPR). Catalytic activities of the Cu-Mn oxides were tested by the oxidation of toluene with molecular oxygen in liquid phase and solvent-free conditions. The molar ratio of Cu:Mn in catalyst was optimized to be 1:1 and thus the corresponding crystalline material was designated as Cu 1.5 Mn 1.5 O 4 .

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Section: Fourier Transform Infrared (Ft-ir)supporting

confidence: 64%

Liquid-phase oxidation of toluene by molecular oxygen over copper manganese oxides

Zhou

et al. 2006

Catal Lett

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“…The quenching cannot prevent changes of crystal symmetry. Therefore, investigation of the cation distribution in Cu-Mn spinel through quenching leaves some doubt about the crystal structure of the materials at high temperatures [9,[19][20][21][22]. In situ measurement at high temperature is necessary to clarify the crystal structure of Cu-Mn oxides.…”

Section: Introductionmentioning

confidence: 99%

In situ high-temperature X-ray and neutron diffraction of Cu–Mn oxide phases

et al. 2010

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Copper-manganese oxides were analyzed by in situ high-temperature powder neutron and X-ray diffraction to investigate their crystal structure. Cu-Mn spinel was found to form a continuous solid solution with cubic symmetry between Mn 3 O 4 and Cu 2 MnO 4 . A high-temperature phase with approximate composition Cu 5 Mn 4 O 9 was shown to have hexagonal symmetry. The cation distribution and lattice parameters of Cu-Mn spinel were resolved through Rietveld refinement of in situ neutron diffraction data. The results demonstrated that the Cu ion has a lower octahedral site preference than manganese ions, and quenching is not a reliable method to determine the equilibrium structure in the system.

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“…5(a)) is assigned to Cu þ on the spinel B site. According to previous XPS studies of CuMn 2 O 4 [46][47][48] the two broad peaks at 932.8 eV and 934.1 eV could be due to Cu þ on the A site and Cu 2 þ on the B site. Shoemaker et al, however, assigned the peak at 934.75 eV to Cu 3 þ on the B site.…”

Section: Resultsmentioning

confidence: 95%

“…In the case of CuMn 2 O 4 , it is known to exist in both a cubic [31,32] and a tetragonal [33] phase, with differing structurally-dependent properties. Waskowska et al [34] synthesized 0.8 inverted cubic CuMn 2 O 4 which has Cu þ and Mn 2 þ on the A-sites and Cu 2 þ , Mn 3 þ and Mn 4 þ taking B-sites.…”

Section: Introductionmentioning

confidence: 99%

Simple synthetic route to manganese-containing nanowires with the spinel crystal structure

Zhang

Hudak

et al. 2016

Journal of Solid State Chemistry

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a b s t r a c tThis report describes a new route to synthesize single-crystalline manganese-containing spinel nanowires (NWs) by a two-step hydrothermal and solid-state synthesis. Interestingly, a nanowire or nanorod morphology is maintained during conversion from MnO 2 /MnOOH to CuMn 2 O 4 /Mg 2 MnO 4 , despite the massive structural rearrangement this must involve. Linear sweep voltammetry (LSV) curves of the products give preliminary demonstration that CuMn 2 O 4 NWs are catalytically active towards the oxygen evolution reaction (OER) in alkaline solution, exhibiting five times the magnitude of current density found with pure carbon black.

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Oxidation mechanism and valence states of copper and manganese in tetragonal CuMn2O4

Cited by 42 publications

References 17 publications

Liquid-phase oxidation of toluene by molecular oxygen over copper manganese oxides

Liquid-phase oxidation of toluene by molecular oxygen over copper manganese oxides

In situ high-temperature X-ray and neutron diffraction of Cu–Mn oxide phases

Simple synthetic route to manganese-containing nanowires with the spinel crystal structure

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