Hydrogen Desorption Properties of Woodceramics

抄録

Hydrogen desorption properties of woodceramics, made from radiata pine wood fiberboards carbonized at 923 K and 1473 K, hydrogenated at a temperature of 303 K at an initial hydrogen pressure of 4 MPa, were investigated by means of thermal desorption spectroscopy. Hydrogen desorption initiated at temperatures of more than 750 K, and the accelerated hydrogen desorption occurred at about 1200 K for woodceramics carbonized at 923 K, but almost no hydrogen desorption was observed for those carbonized at 1473 K. Deposition of magnesium (Mg) enhanced the hydrogen absorption and desorption for woodceramics carbonized at 923 K. The activation energy of hydrogen desorption for woodceramics carbonized at 923 K with and without optimal amount of Mg was about 176 and 130 kJ/mol, respectively. No hydride (MgH₂) formation was observed for the woodceramics deposited with Mg after hydrogenation.