Abstract:

Co-Cr-B amorphous catalysts were synthesized by chemical reduction method.The morphology,structure and composition of the catalyst were characterized by scanning electron microscopy,transmission electron microscopy and X-ray diffraction.The catalytic performance of the catalyst was measured by hydrogen generation from NaBH₄ solution hydrolysis. The results showed that the particle size of the catalyst was reduced with the addition of a small amount of Cr.The specific surface area increased significantly,and the performance of the catalyst was improved.However,excessive addition of Cr caused excessive oxides and Cr ³⁺,covering the surface active sites of the catalyst,which degraded the performance of the catalyst.When the amount-of-substance ratio of Cr to Co was 0.005,the catalyst property was optimal.It showed nearly 2 times higher H₂ generation rate than that of pure Co-B catalyst.In addition,the effect of catalyst quantities,NaBH₄ concentration,reaction temperature and NaOH concentration on the hydrogen generation from NaBH₄ solution hydrolysis were also studied.

Key words: amorphous catalyst, Co-Cr-B, sodium borohydride hydrolysis