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用热脱附谱 (TDS)对不同表面处理的富La混合储H2 合金MlNi4 Co0 6Al0 4 粉末样品进行H2 气吸附和脱附特性的比较和研究。未经表面处理的粉末样品 ,只测到一个H2 脱附峰 (α峰 ) ,脱附温度在 40 0K左右 ;经 6molKOH溶液 ,在 80℃下处理 6h的MlNi4 Co0 6Al0 4 粉末样品 ,有 2个H2 热脱附峰 (β峰和γ峰 ) ,脱附温度分别在 5 40和 6 30K处 ;而用 6molKOH + 0 0 2molKBH4 溶液处理后 ,则有 3个H2 热脱附峰 (α峰 ,β峰和γ峰 ) ,脱附温度分别在 40 0 ,5 30和 6 40K处。TDS研究表明 ,热碱加还原的处理使材料表面对H2 气吸附的活性和容量提高 ,并使各个吸附态的扩散和转变更加容易。
Adsorption and desorption characteristics of H2 on MlNi4Co0 6Al0 4 powder with different surface treatments were investigated by thermal desorption spectroscopy (TDS). Only one H2 desorption peak (α peak) was detected without surface treatment, and the desorption temperature was about 40 0K. Two samples of MlNi4Co0 6Al0 4 powder treated with 6mol KOH solution at 80 ℃ for 6h H2 thermal desorption peak (β peak and γ peak), desorption temperature at 5 40 and 6 30K, respectively; while with 6molKOH +0 2molKBH4 solution treatment, there are three H2 thermal desorption peak (α peak, β Peak and γ peak), desorption temperature at 40 0, 5 30 and 6 40K Department. The TDS study shows that the treatment of hot alkali plus reduction increases the activity and capacity of H2 adsorption on the material surface and facilitates the diffusion and transformation of each adsorbed state.