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Hydrogen adsorption property of lithium doped mesoporous silica

机译：锂掺杂介孔二氧化硅的氢吸附性能

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Lithium, which is light in weight and reacts with hydrogen to form hydride, is one of the practical candidates for hydrogen storage. However, lithium hydride is deficient in decomposition and stability under ambient conditions. The hydrogen adsorption property of lithium-doped mesoporous silica has been investigated to create reversible adsorption sites. After impregnating mesoporous silica with LiCl/ethanol solutions followed by heat treatment in helium, hydrogen adsorption/desorption experiments are carried out at room temperature in a fixed-bed flow apparatus. The adsorption experiments reveal that heat treatment above 200°Cinduces the reversible hydrogen adsorption. The profiles on mass spectroscopy of the gases produced in the heat treatment show that CH{sub}3CH{sub}2Cl is released above 200°C, suggesting that LiCl reacts with ethanol. On the other hand, lithium is hardly released during the whole temperature range, indicating that the adsorption sites including Li are produced after the heat treatment. The hydrogen adsorption site is characterized by 7{sup left}Li MAS NMR and ESR.
机译：锂，其重量轻，与氢气反应形成氢化物，是储氢的实用候选者之一。然而，氢化锂在环境条件下缺乏分解和稳定性。研究了锂掺杂的介孔二氧化硅的氢吸附性能以产生可逆吸附位点。在用LiCl /乙醇溶液浸渍中孔二氧化硅后，然后在氦气中进行热处理，在固定床流动装置中在室温下进行氢吸附/解吸实验。吸附实验表明，高于200°的热处理含有可逆氢吸附。在热处理中产生的气体的质谱上的谱表明，CH {Sub} 3CH {Sub} 2Cl在200℃的高于200℃，表明LiCl与乙醇反应。另一方面，在整个温度范围内几乎不释放锂，表明在热处理后产生包括LI的吸附位点。氢吸附位点的特征在于7 {sup左} Li Mas NMR和ESR。

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