Catalytic hydrogen adsorption of nano-crystallinehydrotalcite derived mixed oxides

tNano-crytalline hydrotalcite derived reduced mixed oxides containing magnesium, nickel and aluminium (MNAM)have been synthesized using coprecipitation and showed successfully nickel catalysed reversible hydrogen adsorp-tion using the temperature programmed technique under near ambient conditions. ICP-MS and XRD analysis ensuredthe adsorbent homogeneity and different crystalline phases of mixed oxides. Morphology and textural properties ofmixed oxides have been explored using the FESEM, BET and HRTEM analysis techniques. Nano-crystalline and mes-porous reduced mixed oxides exhibited a 3.9 wt% H2adsorption capacity in where desorption capacity was 1.9 wt%H2. Hydrogen adsorbed surface and different phases were analysed by XPS, Raman and FTIR analysis techniques.The hydrogen adsorption enthalpy (�H) and entropy (�S) changes of reduced mixed oxides were −47.58 kJ/mol and−120.98 J/mol K, respectively, and the promising desorption activation energy of 65 kJ/mol correspond its reversibilityas potential energy storage material