Advanced functionalized Mg2AlNixHzOy nano-oxyhydrides ex-hydrotalcites for hydrogen production from oxidative steam reforming of ethanol
Résumé
For a sustainable society, it is highly desirable to produce H-2 from renewable sources and with low energy consumption. Functional, cheap and easy-prepared Mg2AlNixHzOy nano-oxyhydrides materials were successfully developed from Mg2AlNixOy nano-composites exhydrotalcites. After an in situ treatment in H-2 at low temperature (450 degrees C), the Mg2AlNixHzOy nano-composites (x > 1) become hydrogen reservoirs, called oxyhydrides, with the presence of hydrogen species of hydride nature that can be stored in the anionic vacancies of the solid. Advanced techniques in presence of H-2 including TPR, in situ XRD and INS were used to study the nano-composites with different Ni contents. The Mg2AlNixHzOy nano-oxyhydrides (x > 1) are shown to be able to simultaneously provide hydride species and to totally convert ethanol and produce H-2 from a water-ethanol mixture in presence of O-2, with very low energy input. In complement to the exothermic partial oxidation reaction, the chemical energy delivered from the strong exothermic reaction between hydride species and O-2 is used. The reaction is sustainable because hydride species are replaced and provided by ethanol. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.