Preparation of Sn-doped CoB catalyst and its catalytic properties in hydrogen production from NaBH4 hydrolysis
Sn-Doped amorphous Co-Sn-B catalysts were prepared by liquid phase co-reduction method.The catalytic activity of Co-Sn-B in hydrogen production from NaBH4 hydrolysis was studied systematical-ly.X-ray diffraction(XRD),scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS)were used to analyze the effect of Sn doping on the microstructure,surface morphologies and va-lence state of Co-Sn-B catalyst.The results show that the Co-Sn-B catalyst maintains a good amorphous structure when the molar ratio of Sn doping is lower than 5.0％,and the introduction of Sn can signifi-cantly improve the dispersion of the catalyst and effectively inhibit the agglomeration of particles.NaBH4 Hydrolysis experiment shows that Sn doping ratio could significantly affect the catalytic activity of the cat-alyst in NaBH4 hydrolysis.When the Sn doping ratio is 1.0％,Co-Sn-B catalyst shows the best catalytic activity.More important is that the catalytic stability of Co-Sn-B is much higher than that of CoB catalyst without the doping of Sn.
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