脱氢
催化作用
氢气储存
球磨机
氧化物
氢
金属
无机化学
材料科学
解吸
氢化镁
氧气
化学
物理化学
冶金
有机化学
吸附
作者
Huiping Yuan,Xugang Zhang,Zhinian Li,Jianhua Ye,Xiping Guo,Shumao Wang,Xiaopeng Liu,Lijun Jiang
标识
DOI:10.1016/j.ijhydene.2011.11.065
摘要
In this study, various nanoscale metal oxide catalysts, such as CeO2, TiO2, Fe2O3, Co3O4, and SiO2, were added to the LiBH4/2LiNH2/MgH2 system by using high-energy ball milling. Temperature programmed desorption and MS results showed that the Li–Mg–B–N–H/oxide mixtures were able to dehydrogenate at much lower temperatures. The order of the catalytic effect of the studied oxides was Fe2O3 > Co3O4 > CeO2 > TiO2 > SiO2. The onset dehydrogenation temperature was below 70 °C for the samples doped with Fe2O3 and Co3O4 with 10 wt.%. More than 5.4 wt.% hydrogen was released at 140 °C. X-ray diffraction indicated that the addition of metal oxides inhibited the formation of Mg(NH2)2 during ball milling processes. It is thought that the changing of the ball milling products results from the interaction of oxide ions in metal oxide catalysts with hydrogen atoms in MgH2. The catalytic effect depends on the activation capability of oxygen species in metal oxides on hydrogen atoms in hydrides.
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