Co/CuO-NiO-Al2O3 catalyst for hydrogen generation from hydrolysis of NaBH4

This paper presents hydrogen generation measurements from the hydrolysis of NaBH4 aqueous solutions catalyzed by Co doping on single, bimetallic and trimetallic oxide supports (Co/CuO, Co/NiO, Co/Al2O3, Co/NiO-Al2O3, Co/CuO-Al2O3, and Co/CuO-NiO-Al2O3). Support materials are synthesized by the co-precipitation method. Then, Co is doped into support materials by the impregnation method. It is found that Co/CuO-NiO-Al2O3 catalyst exhibited high reaction activity with a maximum hydrogen generation rate (HGR) of 2067.2 ml min(-1) g(cat)(-1) at 25 degrees C. The effect of temperature of the solution, Co amount, and recyclability of the catalyst on hydrogen generation with Co/CuO-NiO-Al2O3 catalyst is investigated in detail. In addition, the highest HGR for Co/CuO-NiO-Al2O3 catalyst is obtained at 55 degrees C as 6460.0 ml min(-1) g(cat)(-1). The activation energy is calculated to be 31.59 kJ mol(-1) using Co/CuO-NiO-Al2O3 catalyst. Co/CuO-NiO-Al2O3 catalyst exhibits zero-order reaction kinetics concerning NaBH4 concentration. In addition, the Co/CuO-NiO-Al2O3 catalyst provided high reusability after 5 cycles. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.