Al₂ o₃ supported co-cu-b (Co-cu-b/al₂ o₃ ) catalyst for hydrogen generation by hydrolysis of aqueous sodium borohydride (nabh₄ ) solutions

In this study, Al₂O₃ supported Co-Cu-B (Co-Cu-B/Al₂O₃ ) catalyst was synthesized by chemical impregnation and precipitation method to be used for catalytic hydrogen generation from NaBH₄. Co-Cu-B/Al₂O₃ catalyst was synthesized at various ratios using Co-Cu-B/Al₂O₃ (5-20%). The effect of some parameters such as NaOH concentration (0-7%), NaBH₄ concentration (2.5-7.5%), catalyst amount (25-150 mg) and solution ambient temperature was investigated on the catalytic hydrolysis of NaBH₄. The hydrogen generation rate was found as 2519 and 8962 mL*g^-1 *min^-1 for Co-Cu-B and Co-Cu-B/Al₂O₃ catalysts in NaBH₄ hydrolysis, respectively. The order rate kinetics and activation energy for Co-Cu-B/Al₂ O₃ catalyst were determined as 0.125 and 27 kJ*mol^-1, respectively. The obtained results suggest that Co-Cu-B/Al₂O₃ catalysts can be used for mobile applications of PEMFC systems.