Investigation of Co(1-x)-Bx Catalyst Characteristics By Boron Sources Effect

Abstract

Energy requirement of the World is increasing day by day cause of the active proses like improvement of technology and rising of population. What is more in consequence of effect of global warming, depletion of fossil fuels, the hydrogen has become one of the most popular energy resources sources as renewable energy. Hydrogen generation from the hydrolysis reaction of chemical hydrides has drawn much attention due to its theoretically high hydrogen storage capacity.

Since low cost and high activeness in hydrolysis of chemical hydrides, Co-B catalysts are prime catalyst [1-7]. The impregnation method for catalyst preparation has been used for support. The metal precious and support are used for preparation of catalyst generally [8-11].

In this paper, Co_(1-x)-B_x catalyst characteristics by boron sources effect were investigated. For this aim, boron sources as boric acid (H₃BO₃) and boron oxide (B₂O₃)were selected. The Co_(1-x)-B_x catalysts were synthesis via impregnated method from cobalt(II)chloride(CoCl₂.6H₂O) as cobalt source. The catalysts were impregnated at 85^oC for 2 hours and then calcinated at 500 ^oC for 4 hours to obtained stable structure. The calcinated samples were characterized by BET, XRD, SEM. The similar trend in crystalline structure of both catalysts were determined as orthorhombic and anorthic crystalline systems as seen from XRD. However, by the changing of boron sources the surface area of the catalysis effected. On the other hand the average particle size of Co_(1-x)-B_x catalysts were 2.8 μm while they have variety of structure. The hydrolysis reaction of sodium borohydride (NaBH₄)were performed under variety of temperatures, 1 wt.%NaOH concentration in order to investigate the activation of Co-B catalyst.