Raman spectra of cobalt molybdenum oxide supported on silica

Jeziorowski, H.; Knözinger, Helmut; Grange, Paul; Gajardo, P.

doi:10.1021/j100451a017

Cited by 102 publications

(35 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The typical intensity ratio I 994 /I 819 for Mo/SBA-15(B) and Mo/SBA-15(C) is 0.45, which is smaller than that of the mechanical mixture of 0.64. An identical feature was observed by Braun et al [19] and Jeziorowski et al [46], who prepared the silica supported MoO 3 by thermal spreading (I 994 /I 819 = 0.49) and the impregnation method (I 994 /I 819 = 0.46), respectively. In addition, an interesting phenomenon in the Raman spectra is the change in relative intensity of the two wagging modes at 290 (B 2g ) and 280 cm -1 (B 3g ).…”

Section: Raman Spectroscopysupporting

confidence: 77%

The modification of MoO3 nanoparticles supported on mesoporous SBA-15: characterization using X-ray scattering, N2 physisorption, transmission electron microscopy, high-angle annular darkfield technique, Raman and XAFS spectroscopy

Huang

Bensch

Sigle³

et al. 2007

J Mater Sci

View full text Add to dashboard Cite

MoO 3 was dispersed onto mesoporous SBA-15 by using ammonium heptamolybdate as MoO 3 source. The formation of MoO 3 was carried out by heating the loaded material to 500°C for 3 h in air. Below 13 wt% Mo loading, no reflections of MoO 3 occur in the X-ray powder patterns and even for high MoO 3 contents, the intensities of the reflections are much lower than expected for fully crystalline material. A detailed XAFS analysis reveals that at low Mo contents, the metastable hexagonal modification of MoO 3 is formed despite the high calcination temperature of 500°C. It is highly likely that the nanosize of the particles and the interaction between MoO 3 and SBA-15 stabilize the metastable modification of the material. Nitrogen physisorption experiments show the typical type-IV isotherms indicating that the mesoporosity of the materials is preserved despite the large amount of MoO 3 .Transmission electron micrographs demonstrate the presence of MoO 3 inside the SBA-15 support. The Raman spectra display a remarkable size-dependent intensity loss and several features give evidences for a bond formation between nano-sized MoO 3 particles and the silica support. Moreover, the spectroscopic details suggest the formation of (MoO 3 ) n oligomers.

show abstract

Section: Raman Spectroscopysupporting

confidence: 77%

The modification of MoO3 nanoparticles supported on mesoporous SBA-15: characterization using X-ray scattering, N2 physisorption, transmission electron microscopy, high-angle annular darkfield technique, Raman and XAFS spectroscopy

Huang

Bensch

Sigle³

et al. 2007

J Mater Sci

View full text Add to dashboard Cite

show abstract

“…The bands observed at 267, 698, 810, 883 and 938 cm -1 are typical of α-CoMoO 4 [25][26]. The absence of impurities, such as MoO 3 (which would produce a band at 996 cm -1 ), further substantiates the XRD analysis [25][26] of the synthesized product as pure phase α-CoMoO 4 . The SEM image (Figure 1c) shows granular α-CoMoO 4 particles with a uniform size distribution in the range 1-5 µm.…”

Section: Methodssupporting

confidence: 56%

Facile and large scale combustion synthesis of α-CoMoO4: Mimics the redox behavior of a battery in aqueous hybrid device

Senthilkumar

Meyrick

Selvan

et al. 2014

Chemical Engineering Journal

View full text Add to dashboard Cite

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ). The asymmetric device shows very good cycling stability, with 98 % of initial capacitance retained after 4000 cycles. The α-CoMoO 4 closely mimics the redox mechanism that contributes to the obtained specific capacitance.

show abstract

“…3 and 4, respectively. In the case of the M-O.OO-Mo sample two weak bands at 880 and 955 em -1 have been observed, in addition to the characteristic bands of crystalline Mo0 3 • These two weak bands according to bibliography can be attributed to molybdena interaction species (M070~4 and/or M080~6) [18,19,21,22]. The negative feature which appears in the figure beyond 1000 em -1 is due to the high sensitivity of the spectrometer.…”

Section: Qualitative Analysis Of N0mentioning

confidence: 89%

“…These must be considered as: (a) the anti symmetric stretching mode of Mo-OMo bridges as far as the peak at 880 cm -1 is concerned and (b) the Mo =°stretching mode giving the peak at 955cm-1 [18,21,22]. The weakening of the Raman bands attributed to crystalline MoO) with the addition of Be 2 + can be attributed to the formation of better dispersed MO(VI) surface species.…”

Section: Discussionmentioning

confidence: 99%

Characterization of Mo Species Supported on SiO₂ Modified with Be²⁺ and Mg²⁺

Aroni

1997

Ber Bunsenges Phys Chem

View full text Add to dashboard Cite

Tho series of modified carriers (m.c.) have been prepared by doping silica with various amounts of Be 2 + and Mg 2 + . The prepared m.c. have been used as supports for the preparation of supported MO(VI) oxide catalysts. The magnitude of interactions between Si0 2 and Be 2 + or Mg 2 + nitrates depends on the kind and content of the cation. After calcination at 600°C a greater fraction of cations remains on the support surface as well dispersed M(NO~t in the case of Mg 2 + m.c. Concerning the Mo containing samples it was found that doping by Be 2 + and Mg + causes a solid state transformation of octahedral MO(VI) to tetrahedral MO(VI). As before, the extent of the effect differs between Be 2 + and Mg 2 + and it varies with the content of cation. This effect has been attributed to the inhibition of the polymerization of monomeric Mo(VI) species and/or to the formation of molybdate salts.

show abstract

Raman spectra of cobalt molybdenum oxide supported on silica

Cited by 102 publications

References 4 publications

The modification of MoO3 nanoparticles supported on mesoporous SBA-15: characterization using X-ray scattering, N2 physisorption, transmission electron microscopy, high-angle annular darkfield technique, Raman and XAFS spectroscopy

The modification of MoO3 nanoparticles supported on mesoporous SBA-15: characterization using X-ray scattering, N2 physisorption, transmission electron microscopy, high-angle annular darkfield technique, Raman and XAFS spectroscopy

Facile and large scale combustion synthesis of α-CoMoO4: Mimics the redox behavior of a battery in aqueous hybrid device

Characterization of Mo Species Supported on SiO₂ Modified with Be²⁺ and Mg²⁺

Contact Info

Product

Resources

About

Raman spectra of cobalt molybdenum oxide supported on silica

Cited by 102 publications

References 4 publications

The modification of MoO3 nanoparticles supported on mesoporous SBA-15: characterization using X-ray scattering, N2 physisorption, transmission electron microscopy, high-angle annular darkfield technique, Raman and XAFS spectroscopy

The modification of MoO3 nanoparticles supported on mesoporous SBA-15: characterization using X-ray scattering, N2 physisorption, transmission electron microscopy, high-angle annular darkfield technique, Raman and XAFS spectroscopy

Facile and large scale combustion synthesis of α-CoMoO4: Mimics the redox behavior of a battery in aqueous hybrid device

Characterization of Mo Species Supported on SiO2 Modified with Be2+ and Mg2+

Contact Info

Product

Resources

About

Characterization of Mo Species Supported on SiO₂ Modified with Be²⁺ and Mg²⁺