过渡金属氧化物掺杂NaAlH4放氢性能

采用PCT (Pressure-Content-Temperature)、XRD、SEM等测试方法对掺杂不同过渡金属氧化物(TiO2,ZrO2,Cr2O3,ZnO)的NaAlH4试样的放氢性能进行研究.结果表明,掺杂TiO2和ZrO2的NaAlH14试样的放氢性能较好.此外,所研究球磨工艺明显改善了NaAlH4的放氢性能.SEM结果发现,球磨3h的Zr-NaAlH4试样效果最佳,此时粉体吸附在较大颗粒四周,随球磨时间的延长,NaAlH4粉体颗粒发生团聚.XRD结果表明,NaAlH4球磨后的结构并未发生明显变化,这说明NaAlH4具有良好的稳定性.

Study on Dehydrogenation Performances of NaAlH4 Doped with Transition Metal Oxides

Dehydrogenation performances of NaAlH4 doped with transition metal oxides (TiO2, ZrO2, Cr2O3, ZnO) were studied by PCT (Pressure-Content-Temperature), XRD and SEM. The results indicate that the dehydrogenation performances of NaAlH4 doped with TiO2 or ZrO2 are preferable. In addition, the study on different ball-milling methods shows that the ball milling leads to a marked increase of dehydrogenation amount. SEM results show that with prolonging the milling time from 1 to 3 h, the size of the complex became smaller, and these particles were scattered on larger globes. However, those particles would reunite again if the milling time was prolonged from 3 to 6 h. The ball milling does not cause evident structure change, indicating that NaAlH4 has good stability.