ChemInform Abstract: Interactions of Molybdenum Oxide with Various Oxide Supports: Calcination of Mechanical Mixtures.

Abstract

Intimate mechanical mixtures of various support materials and an amount of MoO3 corresponding to less than a monolayer are calcined at 720 K and the calcined mixtures have been investigated by laser Raman and FTIR 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

“…Raman spectroscopy is one of the effective methods to probe crystalline and amorphous nanoscale oxides [23,24]. Raman spectra of the impregnated samples before calcination are displayed in Fig.…”

“…Therefore, the change in the intensity ratio for this doublet may be attributed to the distortions along the MoO 4 chains. Finally, a weak shoulder appears at about 953 cm -1 corresponding to the Mo=O vibration of a polymeric molybdate species interacting with the support [24].…”

“…Molybdenum-based catalysts have been investigated intensively [19][20][21][22][23][24] because of their importance in the technical processes, such as propene metathesis [25,26], propene oxidation [27,28], methanol oxidation [29], ethanol oxidative photochemical reaction, and most importantly in hydrodesulfurization (HDS) processes, which represent one of the largest groups of catalytic steps in petroleum and petrochemical reactions. Recently, SBA-15-supported MoO 3 materials were used as an intermediate for the preparation of MoS 2 catalysts.…”

Template-free synthesis of hierarchical porous SnO2

“…As an n-type wide-band semiconductor (Eg = 3.6 eV, 300 K), it is widely used in many areas such as gas sensor [1,2], electrode material [3,4], solar cells [5,6], and catalysts [7]. For these key functional applications, it has been prepared through a wide variety of synthetic approaches such as solvothermal method, spray pyrolysis, sputtering, solution-phase growth, vapor-liquid-solid (VLS) growth, and molten salt synthesis, among others [8][9][10][11][12][13].…”

Reactivity of MoO3: effect of molybdenum with Al2O3 precursor and the presence of water vapour on the dispersion of the surface phases

“…However, catalytic properties are not only determined by the high dispersion degree, but also by the structure of the resulting active phase. The dispersion and the nature of the supported active oxide phase are usually determined by the nature of the support oxide and the preparation method [8,9].…”