The hydrogenation of undoped and Ti-doped A1 in supercritical carbon dioxide

Abstract

In this study, materials were selected for hydrogenation in a supercritical medium based on their high hydrogen weight content. We focused on A1H3 and then considered the thermodynamic limitations of the material when implementing hydrogenation using the standard solid-gas technique. For this material, hydrogenation is only possible under extreme temperatures and pressures, making it necessary to use a different approach for hydrogenation. In order to overcome these thermodynamic barriers, hydrogenation reactions of undoped and Ti-doped Al were carried out in a supercritical fluid medium (C02) in order to overcome thermodynamic barriers. Samples were then analyzed through XRD, 27Al NMR and PCT apparatus. Although it appears that slight hydrogenation of the undoped and Ti-doped Al occurred, it is difficult to conclude the extent of hydrogenation with certainty due to the complications caused by the presence of trace A1H3 remaining after dehydrogenation.