Co-Bi-B三元复合材料的制备及其在NaBH_(4)水解制氢中的应用

Preparation of Co-Bi-B ternary composite and its application in hydrolysis of NaBH_(4)

通过液相共还原法制备了一种新型Co-Bi-B三元复合催化剂材料,并采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱分析(XPS)等表征手段对材料的结构、形貌和元素分布进行了分析。系统考察了Co-Bi-B不同掺杂摩尔比和不同温度对催化NaBH_(4)水解制氢速率的影响。结果表明:掺杂Bi得到的三元合金催化剂呈晶体结构,且能够显著减小催化剂的粒径、减轻团聚现象。当化学还原温度为0℃、掺杂摩尔比Bi∶Co=1∶9时,Co-Bi-B三元催化剂展示了最佳的催化性能,并通过阿伦尼乌斯(Arrhenius)方程计算得到该催化剂的活化能为38.97kJ/mol。

A new type of Co-Bi-B ternary alloy catalyst was prepared by a liquid phase co-reduction method,which was then characterized by X-ray diffractometer(XRD),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS),etc.The effects of doping molar ratio and temperature on the catalytic performance of hydrogen generation from the hydrolysis of sodium borohydride were systematically investigated.The experimental results showed that the ternary alloy catalyst obtained by doping Bi had a well-defined crystal structure and the doping of Bi reduced the particle size of the catalyst and alleviated the agglomeration.When the molar ratio of Bi∶Co was 1∶9 and the reduction temperature was 0℃,the as-prepared Co-Bi-B ternary catalysts exhibited the best catalytic performance,and the activation energy of the catalyst calculated by Arrhenius equation was 38.97kJ/mol.