非晶态Ni-W-B合金的制备及催化硼氢化钠水解制氢

Fabrication of Amorphous Ni-W-B Alloy and Catalytic Sodium Borohydride Hydrolysis for Hydrogen Generation

采用化学还原法合成了非晶态金属硼化物Ni-W-B合金,并用于硼氢化物水解制氢。通过X射线衍射分析（XRD）、扫描电子显微镜（SEM）、X射线能谱分析（EDX）证明,样品Ni-W-B为非晶态的、均匀的球形颗粒,平均粒径约60~70 nm。催化活性实验证明,Ni-W-B合金对Na BH4水解制氢有较好的催化活性;W的含量对催化活性有一定影响,其W与Ni的最佳摩尔比为0.1。影响因素实验证明,Na BH4水解制氢速率与体系温度及催化剂用量呈正比。使用寿命测试证明,经过10次水解循环之后催化剂活性没有明显降低,说明Ni-W-B催化剂有较好的稳定性。

Nickel-tungsten-boron（Ni-W-B） amorphous alloy powders are synthesized by chemical reduction of nickel chloride and sodium tungstate with sodium borohydride solution to study the hydrogen production from Na BH4 solution. The catalyst powders are characterized by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The W/Ni molar ratio is varied in the catalyst in order to study the influence of W content on hydrogen production and contrast it with Ni-B catalyst. The hydrolysis of Na BH4 on Ni-W-B catalyst reveals that the reaction temperature has a significant affect on hydrogen generation rate, the higher the temperature, the greater the rate of hydrogen generation. With the amount of catalyst increases, the hydrogen generation rate also tend to increase. The catalytic activity have no attenuation after several hydrolytic cycles, which demonstrates Ni-W-B catalyst has excellent durability.