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

Abstract

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. © S.C. Virtual Company of Phisics S.R.L. All rights reserved.