Materials, Methods & Technologies, Volume 7, 2013

Rezumat: In this studying, Co-B catalysts were prepared by sol-gel method via kinds of cobalt source for clarifying the effect of these for characteristic properties of Co-B catalysts. Co sources, cobalt(II)chloride (CoCl2.6H2O), cobalt(II)sulfate (CoSO4.7H2O) and cobalt(II)nitrate (Co(NO3)2.6H2O), were used as a metal source with boron oxide (B2O3) while citric acid (C6H8O7) used as organic ligand to forming sol-gel structure. The crystalline structures of Co-B catalysts were determined by X-ray diffraction. The N2 sorption technique was used for analyzing catalysts surface area. The variety of Co-B catalysts morphological properties were investigated via scanning electron microscope. By the effect of cobalt sources the Co-B catalyst’s properties were altered that clarified from analysis results. The amorphous Co-B catalyst produced from CoCl2.6H2O as metal source had 2 -1 the largest porous surface area with 122.7 m .g . Investigation of hydrolysis were performed under o variety of temperatures (22, 40 and 60 C), NaOH concentrations (1-15 wt. %) and NaBH4/Co-B catalyst ratio (2-40 wt./wt.) ratios in order to investigate the activation of Co-B catalyst. The -1 -1 maximum hydrogen generation rate 0.84L H2.min .g was obtained under 40 °C, 10 wt. % NaOH and 9.52wt./wt. NaBH4/Co-B catalyst ratio. Yet the kinetic investigations, the reaction order was found that zero order with 0.9954 coefficient of correlation and 51.83 kJ/mol activation energy.