Catalitic effect of Co on hydrogen desorption form nanostucturated magnesium hydride
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To study the influence of 3d transition metal addition on desorption kinetics of MgH2 ball milling of MgH2-Co blends was performed under Ar. Microstructural and morphological characterization, performed by XRD and SEM, show a huge correlation with thermal stability and hydrogen desorption properties investigated by DSC. A complex desorption behavior is correlated with the dispersion of the metal additive particles on hydride matrix. The activation energy for H-2 desorption from MgH2-Co composite was calculated from both non-isothermal and isothermal methods to be 130 kJ/mol which means that mutually diffusion and nucleation and growth of new phase control the dehydration process.
Keywords:hydrogen storage / magnesium hydride / Johnson-Mehl-Avrami equation / Kissinger method / Ozawa method / dehydration kinetics
Source:Hemijska industrija, 2008, 62, 3, 114-118
- 6th Conference of Young Researchers, Dec 24-26, 2007, Belgrade, Serbia