Co-MOF衍生钴基催化剂制备及其NaBH_(4)水解制氢性能

Preparation of Co-MoF-derived Cobalt-based Catalyst and its Properties for Hydrogen Production from NaBH_(4) Hydrolysis

采用钴基MOF为前驱体,通过惰性气氛碳化法制备了系列衍生钴基催化剂,探讨了不同催化剂在NaBH_(4)水解制氢中的催化性能.采用X射线衍射仪(XRD),透射电子显微镜(TEM),X射线光电子能谱分析(XPS),热重分析(TGA)等深度分析了不同碳化条件对Co-MOF衍生钴基催化剂的晶相结构、微观形貌、元素价态等的影响.研究结果表明:在不同碳化温度下,Co-MOF衍生钴基催化剂展示了不同的微观形貌、晶相结构和元素价态,随着惰性碳化温度升高节点钴逐步从离子钴向单质钴转化.NaBH4水解制氢实验表明不同碳化温度可以显著影响催化剂的水解制氢催化活性和稳定性,其中以钴离子转化的Co-MOF(300)催化剂展示了最佳催化活性,明显高于高温碳化的钴基催化剂.

A series of cobalt-based derived catalysts were prepared by inert atmosphere carbonization method based on cobalt-based MOF precursor.The catalytic performance of different catalysts in hydrogen production from NaBH_(4) hydrolysis was investigated.The effects of different carbonation temperatures on the crystal structure,microstructure and elemental valence of Co-MOF catalysts were analyzed by X-ray diffractometer(XRD),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS)and thermo-gravimetric analysis(TGA).The results show that:Co-MOF derived catalysts exhibit different morphologies,crystal phase and elemental valence states at different carbonization temperature.Node-cobalt gradually transforms to elemental cobalt from ionic cobalt with the carbonization temperature increasing under inert atmosphere.The hydrogen production experiment from NaBH_(4) hydrolysis showed that different carbonization temperatures could significantly affect the catalytic activity and stability of the catalysts during NaBH_(4) hydrolysis.Among all these catalysts,Co-MOF(300)catalyst from cobalt ion conversion shows the best catalytic activity,which is significantly higher than other cobalt-based catalysts from the high temperature carbonization.