Studies on catalytic behavior of co–cr–b/al₂ o₃ in hydrogen generation by hydrolysis of nabh₄

In this present study, the chemical reduction technique was used to synthesize Al₂O₃ supported Co-Cr-B catalyst (Co-Cr-B/Al₂O₃). The effects of the concentration of NaBH₄, NaOH, amount of catalyst, ratio of metal/ Al₂ O₃and temperature were discussed in detail. The results show that the reaction rate of hydrolysis first rises up and then goes down subsequently with the increase of NaBH₄ concentration, as well as the concentration of NaOH. It was observed that the hydrogen generation rate increases with the molar content of metal changing from 2.5% to 5 wt%. However, when the metal/Al₂O₃ molar ratio is located from 5% to 20 wt%, the rate of hydrogen generation goes down. The hydrolysis kinetic order and the activation energy (E_E ) of NaBH₄ in the presence of Co-Cr-B/Al₂O₃ catalyst were found as 0.15 and 37.34 kJ*mol^-1, respectively. According to the results obtained, Co-Cr-B/Al₂O₃ catalyst can be used as a promising material in PEMFC mobile systems.