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Journal of Chemistry
Volume 2014, Article ID 185957, 9 pages
Research Article

Sonochemical Approach to Synthesis of Co-B Catalysts and Hydrolysis of Alkaline NaBH4 Solutions

Department of Chemical Engineering, Yildiz Technical University, 34210 Istanbul, Turkey

Received 9 March 2014; Accepted 16 May 2014; Published 11 June 2014

Academic Editor: Nurettin Sahiner

Copyright © 2014 Bilge Coşkuner et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Co-B catalysts are promising candidates for hydrogen evolution via hydrolysis of alkaline sodium borohydride (NaBH4) solutions. In the present paper, a sonochemical approach was investigated for synthesis of Co-B catalysts and hydrolysis of alkaline NaBH4 solutions. Sonochemical application on synthesizing process improved the intrinsic and extrinsic properties of Co-B catalysts such as crystal, spectral, surface area, pore volume, pore diameter, and particle size. Co-B catalysts prepared by sonochemical approach possessed smaller particle size, higher surface area, and higher pore volume than the Co-B catalysts prepared by coprecipitation synthesis. The effects of sonochemical process on hydrolysis of alkaline NaBH4 solutions were investigated by Arrhenius theory. It was clearly demonstrated that the advantages of alkaline NaBH4 solution sonohydrolysis provide superficial effects on hydrogen evolution kinetic as maximum H2 generation rate (HGR) and minimum activation energy ( ).