Hydrogen Generation on NaBH4 Catalyzed by Co-B/Rare Earth Oxides

摘要:

研究了催化物体系Co2B/稀土氧化物对NaBH4 放氢性能的影响。结果显示，掺杂Co-B/CeO2 和Co2B/Sm2O3明显增加了NaBH4的放氢量，在所有的掺杂试样中，掺杂 Co2B:CeO2 比例为1:1混合催化剂的试样具有最大放氢量274 mL。然而，掺杂混合催化剂试样放氢速率的研究显示，掺杂系统混合催化剂使得NaBH4的放氢速率明显下降。此外，掺杂试样的微观结构研究显示，与掺杂Co2B的试样相比，掺杂混合催化剂试样的微观结构更加松散。Co2B/CeO2催化剂的研究发现，多孔状的微观结构对提高NaBH4放氢量是有益的，但是，对 Co2B/La2O3和 Co2B/Sm2O3 等催化剂的研究结果显示，微观结构中的多孔结构与NaBH4放氢量没有直接关系

Abstract:

The effect of catalyst systems Co2B/rare earth oxides on the properties of hydrogen generation of NaBH4 was studied. The results show that doping with Co2B/CeO2 and Co2B/Sm2O3 increases the amount of hydrogen generation of NaBH4 obviously. Among all samples, the sample doped with Co2B/CeO2 with ratio of 1:1 has the largest amount of hydrogen release reaching about 274 mL. However, the investigation on the rate of hydrogen release indicates that doping with Co2B/rare earth oxides decreases the rate of hydrogen release obviously. Furthermore, the analysis on the microstructures of the reaction products of the samples doped with Co2B/rare earth oxides shows that, doping with Co2B/rare earth oxides makes the microstructures of the reaction products looser compared with doping with Co2B. Significantly, the investigation on doping with Co2B/CeO2 shows that the porous structure is helpful for improving the amount of hydrogen generation. However, the investigation on the samples doped with Co2B/La2O3 and Co2B/ Sm2O3 indicates that there is no direct relationship between the amount of hydrogen generation and the porous structure