A Thermodynamic Approach to Predict the Metallic and Oxide Phases Precipitations in Nuclear Waste Glass Melts

Gossé, Stéphane; Guéneau, C.; Bordier, S.; Schuller, S.; Laplace, Annabelle; Rogez, J.

doi:10.1016/j.mspro.2014.10.011

Cited by 13 publications

(5 citation statements)

References 31 publications

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“…Experimental 23 Na isotropic chemical shift δ iso versus the theoretical isotropic shielding σ iso (obtained using DFT-GIPAW VASP calculations). The linear regression In agreement with thermodynamic data [61], it can be suggested that this behavior could be extrapolated to higher MoO 3 contents. The miscibility gap at 1473 K represented in the ternary SiO 2 -Na 2 O-MoO 3 shows the continuity of the phase separation phenomenon between the silicate network and the molybdates.…”

Section: Influence Of Glass Structure On the Initial Alteration Rate supporting

confidence: 84%

Phase separation and crystallization effects on the structure and durability of molybdenum borosilicate glass

Nicoleau¹,

Schuller²,

Angeli³

et al. 2015

Journal of Non-Crystalline Solids

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Section: Influence Of Glass Structure On the Initial Alteration Rate supporting

confidence: 84%

Phase separation and crystallization effects on the structure and durability of molybdenum borosilicate glass

Nicoleau¹,

Schuller²,

Angeli³

et al. 2015

Journal of Non-Crystalline Solids

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“…From the phase diagram and differential thermal analysis (DTA) & differential scanning calorimeter (DSC) analysis of sodium–molybdate phase, there are three stable compounds found, that is, Na 2 MoO 4 , Na 2 Mo 2 O 7 , and Na 2 Mo 4 O 13 . The melting point of Na 2 MoO 4 compound is ≈685 °C and phase changes in three different temperatures are shown in the DTA curve .…”

Section: Methodsmentioning

confidence: 99%

Search for New Molybdenum‐Based Crystal Scintillators for the Neutrino‐Less Double Beta Decay Search Experiment

Kim

Pandey

Khan

et al. 2019

Crystal Research and Technology

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grown by a Czochralski method. Syntheses of the polycrystalline materials are discussed based on the thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC) analysis and the crystals' structures are reported based on the X-ray powder diffraction (XRD) analysis. Luminescence properties of the crystals from room temperature to 10 K are studied by exciting the crystal with a 280 nm light emitting diode (LED). The scintillation light yields of the crystals at different low temperatures are studied by exciting the crystal with strontium-90 ( 90 Sr) beta source. The developed crystals are not luminescent at room temperature. At cryogenic temperature, however, they become luminescent with longer decay times. This work also reports on the luminescence and scintillation properties of ZnMoO 4 , PbMoO 4 , Pb 2 MoO 5 , and CaMoO 4 crystals which have been grown at other institutes. The newly developed crystals' results are compared with the result of a standard CaMoO 4 crystal. Among the new Mo-based crystals, the Na 2 Mo 2 O 7 crystal shows the most promising properties for the neutrino-less double beta decay (0 ) search experiments at cryogenic temperature.

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“…During calcination at 1023 K, the melting temperature of MoO 3 was approached (T melting = 1075 K at 1 atm), and MoO 3 and SiO 2 are not miscible in the liquid state at moderate temperature. 41 Although experimental data are apparently lacking for the MoO 3 -SiO 2 phase diagram, it is possible that during calcination, partial melting of the catalyst occurred. Alternatively, considering the water solubility of silico-molybdic acid and of its ammonium salt, it is possible that partial dissolution of silica occurred during impregnation.…”

Section: Wileyonlinelibrarycom/jctbmentioning

confidence: 99%

A study of molybdena catalysts in ethanol oxidation. Part 1. Unsupported and silica‐supported MoO₃

Pampararo

Garbarino

Ardoino

et al. 2021

J of Chemical Tech & Biotech

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Background: Acetaldehyde is a main organic intermediate for manifold chemical products. In the near future, its production using renewable raw materials is rapidly becoming highly desirable. In this paper, investigations on pure and silica-supported molybdenum oxide (MoO 3 ) as catalysts for the ethanol oxidative dehydrogenation process to acetaldehyde are reported.Results: Acicular pure ⊍-MoO 3 crystals and silica-gel supported MoO 3 (1, 5 and 12% wt MoO3 /wt support ) were prepared by the thermal decomposition method and by incipient wetness impregnation, respectively. Catalysts were studied and extensively characterized assessing structural, morphological and chemical properties. The samples were tested in ethanol oxidative dehydrogenation through Temperature Programmed Surface Reaction (TPSR) and steady-state measurements. MoO 3 /SiO 2 samples were constituted by MoO 3 particles weakly interacting with the support, but also by some molybdate species entering the silica framework and significantly modifying the silica morphology. High catalyst acidity limits oxydehydrogenation yield, catalyzing the competitive dehydration reaction to ethylene. Thus, the highest obtained acetaldehyde yield was ≈60%. Molybdenum loss by MoO 3 volatilization was found on MoO 3 /SiO 2 . Conclusion:The produced and characterized catalysts are active, and allow quite a high yield to acetaldehyde. Slight deactivation was observed and also investigated.

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A Thermodynamic Approach to Predict the Metallic and Oxide Phases Precipitations in Nuclear Waste Glass Melts

Cited by 13 publications

References 31 publications

Phase separation and crystallization effects on the structure and durability of molybdenum borosilicate glass

Phase separation and crystallization effects on the structure and durability of molybdenum borosilicate glass

Search for New Molybdenum‐Based Crystal Scintillators for the Neutrino‐Less Double Beta Decay Search Experiment

A study of molybdena catalysts in ethanol oxidation. Part 1. Unsupported and silica‐supported MoO₃

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A Thermodynamic Approach to Predict the Metallic and Oxide Phases Precipitations in Nuclear Waste Glass Melts

Cited by 13 publications

References 31 publications

Phase separation and crystallization effects on the structure and durability of molybdenum borosilicate glass

Phase separation and crystallization effects on the structure and durability of molybdenum borosilicate glass

Search for New Molybdenum‐Based Crystal Scintillators for the Neutrino‐Less Double Beta Decay Search Experiment

A study of molybdena catalysts in ethanol oxidation. Part 1. Unsupported and silica‐supported MoO3

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A study of molybdena catalysts in ethanol oxidation. Part 1. Unsupported and silica‐supported MoO₃