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采用氢气反应球磨法,将煤基微晶碳及少量Ni和Al添加到镁粉中在1MPa氢气中球磨3h制得储氢材料67Mg29C3Ni1Al。放氢测试结果表明,温度越高,放氢速度越快,放氢量越大,数据拟合得出放氢反应为表观一级反应。根据阿伦尼乌斯方程计算得出,在300~350℃范围内,放氢反应表观活化能为(138.0±6)kJ/mol。与储氢材料70Mg30C及纯MgH2相比,微晶碳和催化剂Ni、Al缩短了储氢材料的放氢时间,加快了放氢速度,提高了放氢量,降低了表观活化能,放氢动力学性能得到了改善。
Hydrogen reaction ball milling method, the coal-based microcrystalline carbon and a small amount of Ni and Al added to the magnesium powder in 1MPa hydrogen ball milling 3h hydrogen storage material prepared 67Mg29C3Ni1Al. Hydrogen release test results show that, the higher the temperature, the faster the hydrogen release rate, the greater the amount of hydrogen release, the data fitting conclusion is that the hydrogen release reaction is an apparent first order reaction. According to the Arrhenius equation, the apparent activation energy of the hydrogen evolution reaction is (138.0 ± 6) kJ / mol at 300 ~ 350 ℃. Compared with hydrogen storage material 70Mg30C and pure MgH2, microcrystalline carbon and Ni, Al catalysts shorten the hydrogen releasing time of hydrogen storage material, accelerate the rate of hydrogen releasing, increase the amount of hydrogen releasing, lower the apparent activation energy and release hydrogen Kinetic performance has been improved.