Effect of temperature on the γ-MnO2/“Ag2O” hydrogen getter structure
作者： Christophe Chlique , David Lambertin , Fabien Frizon , Philippe Deniard , Stéphane Jobic
DOI: 10.1016/J.FUSENGDES.2016.06.014
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摘要: Abstract Manganese oxides based materials, as γ-MnO2/“Ag2O”, are considered to control the hydrogen risk from radioactive waste packaging. The efficiency of trapping at room temperature has been demonstrated. However, in accidental conditions, increasing can be detrimental for performance nuclear packages. As a function temperature, structural evolution γ-MnO2/“Ag2O” getter was determined by X-Ray Diffraction (XRD), Pair Distribution Function (PDF) and Thermogravimetric Analysis (TGA). Kinetics were related structure γ-MnO2/“Ag2O”. Ramsdellite (R-MnO2) pyrolusite (β-MnO2) main phases existing below 400 °C, then Ag-hollandite (quadratic), (monoclinic), Mn2O3 Mn3O4 formed 500 °C, 600 °C, 700 °C 850 °C, respectively. Hydrogen efficient until 400 °C where γ-MnO2 remains.
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