金属有机骨架化合物MIL-101负载纳米Ni的制备及储氢性能

Preparation and hydrogen storage properties of metal organic frameworks MIL-101 loaded with nano Ni

采用2-甲基咪唑代替HF酸以溶剂热法成功制备了纯度较高的金属有机骨架化合物MIL-101,利用过量浸渍法结合液相还原法成功负载了Ni,制备出Ni/MIL-101复合材料。通过XRD、SEM、TEM、BET、TG对所得MIL-101、Ni/MIL-101复合材料的结构、形貌、比表面积孔径及热稳定性进行表征,对MIL-101、Ni/MIL-101复合材料的氢扩散系数、吸氢形成焓进行测定计算,考查其储氢能力。结果表明,该方法成功制备了Ni/MIL-101复合材料,该产物是一种两类孔结构的金属骨架化合物,Ni的负载可降低Ni/MIL-101复合材料的吸氢形成焓,Ni/MIL-101复合材料的氢扩散系数达到7.6373×10-7 cm/s,提高了MIL-101的储氢能力。

The high purity metal organic frameworks MIL-101 was prepared by the solvent hot method using2-methyl imidazole instead of HF acid in this experiment.Ni/MIL101 composite was prepared from the successful load of Ni by the method of excessive impregnation and liquid phase reduction.The product structure,morphology,specific surface area and pore size and thermal stability were characterized via XRD,SEM,BET,TG,FIRT.The hydrogen diffusion coefficient and hydrogen absorption enthalpy of MIL-101 and Ni/MIL-101 composite were measured to investigate the hydrogen storage capacity.The results show that Ni/MIL-101 composite is successfully prepared by this method.The product is a metal skeleton compound with two kinds of pore structure,and the load of Ni can reduce the hydrogen absorption enthalpy of Ni/MIL-101 composite,and the hydrogen diffusion coefficient of Ni/MIL-101 composite reaches 7.6373×10-7 cm/s,which improves the hydrogen storage capacity of MIL-101.