A multifactor study of catalyzed hydrolysis of solid NaBH4 on cobalt nanoparticles: Thermodynamics and kinetics

作者：Andrieux Jerome^*; Swierczynski Dariusz; Laversenne Laetitia; Garron Anthony; Bennici Simona; Goutaudier Christelle; Miele Philippe; Auroux Aline; Bonnetot Bernard

来源：International Journal of Hydrogen Energy, 2009, 34(2): 938-951.

DOI：10.1016/j.ijhydene.2008.09.102

• Hydrogen storage
• Solid sodium borohydride
• Hydrolysis reaction
• Catalysis
• Cobalt
• Kinetics
• Thermodynamics

In the present work, hydrogen generation through hydrolysis of a NaBH4(S)/catalyst((S)) solid mixture was realized for the first time as a solid/liquid compact hydrogen storage system using Co nanoparticles as a model catalyst. The performance of the system was analysed from both the thermodynamic and kinetic points of view and compared with the classical catalyzed hydrolysis of a NaBH4 solution. The kinetic analysis of the NaBH4(S)/catalyst((S))/H2O(1) system shows that the reaction is first order with respect to the catalyst concentration, and the activation energy equal to 35 kJ mol(NaBH4)(-1). Additionally, calorimetric measurements of the heat evolved during the hydrolysis of NaBH4 solutions evidence the global process energy (-217 kJ mol(NaBH4)(-1)). Characterization of the cobalt nanoparticles before and after the hydrolysis associated with the calorimetric measurements suggests the "in situ" formation of a catalytically active CoxB phase through "reduction" of an outer protective oxide layer that is regenerated at the end of reaction.

• 出版日期2009-1