THE DEVELOPMENT OF HYDROGEN SEPARATION METHOD USING HYDROGEN STORAGE ALLOY FILMS

用镀镍膜上沉积的Ca-Ni合金膜实现了H_2-CO气体的分离，并研究了非晶态Ca-Ni合金文件夹在H_2-CO混合气体中对有害CO的耐受性。LaNi5被认为是一种很好的氢分离材料，因为它比Pd便宜，并且在中等温度和压力下具有令人钦佩的吸氢能力。非晶态LaNi5薄膜表现出良好的分离系数，但氢渗透速率不足，与LaNi5相比，CaNi5在低压下能吸收更多的氢。为了提高氢渗透速率，利用Ca-Ni合金进行了氢分离膜的研制。所制备的氢气分离器由聚合体、镍和非晶态的CaNi_lt；4.2&gt；文件夹组成。金属层厚度约为1微米。在最佳条件下，通入气体中氢的浓度可高达99%，其组成为50%H_2-50摩尔%CO。结果表明，Ni/CaNi4.2&gt；薄膜的渗透速率是Ni/CaNi5薄膜的两倍，X射线光电子能谱测试结果表明，非晶态Ca-Ni合金涂层在H2混合气体中具有良好的抗有害CO的能力。

The H_2-CO gas separation has been performed using the Ca-Ni alloy films deposited on a Ni-coated polyner membrane and the resistance of amorphous Ca-Ni alloy files to harmful CO in H_2-CO gas mixtures has been studied.A palladium file is known to exhibit excellent properties for hydrogen separation. The film is, however, very expensive and must be operated at an elevated temperature.LaNi_5 is considered to be a good candidate as a hydrogen separation material because it is less expensive than Pd and has an admirable ability to absorb hydrogen at moderate temperatures and pressures. The amorphous LaNi_5 films exhibited a good separation factor, but the hydrogen permeation rates were insufficient.CaNi_5 can absorb much hydrogen at low pressures in comparison with LaNi_5. In order to increase the hydrogen permeation rate, the development of hydrogen separation film using the Ca-Ni alloy has been performed. The hydrogen separator prepared consisted of polyaside, nickel and amorphous CaNi_<4.2> files. The thickness of metal layer was ca. 1mum. Hydrogen in the applied gas with a composition of 50 mol% H_2 - 50 mol% CO was concentrated to as high as 99 mol% in the permeated gas under the best conditions. It was found that the permeation rate of the Ni/CaNi_<4.2> film was two times as large as that of the Ni/CaNi_5 film.As a result of the experiments using X-ray photoelectron spectroscopy, the amorphous Ca-Ni alloy files had an excellent resistance to harmful CO in the H_2 gas mixtures.