THE DEVELOPMENT OF HYDROGEN SEPARATION METHOD USING HYDROGEN STORAGE ALLOY FILMS

本文报道了在镀Ni的聚合物膜上沉积的Ca-Ni合金膜用于H_2-CO气体分离，并研究了非晶态Ca-Ni合金膜对H_2-CO混合气体中有害CO的抵抗能力。钯膜具有优良的氢分离性能。LaNi_5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良好的吸氢能力。非晶态LaNi_5薄膜具有较好的分离因子，但氢渗透速率较低，与LaNi_5薄膜相比，CaNi_5薄膜在较低的压力下可以吸收更多的氢。为了提高氢渗透速率，已经进行了使用Ca-Ni合金的氢分离膜的开发。所制备的氢气分离器由聚山梨醇酯、镍和非晶态CaNi_2膜组成<4.2>。金属层的厚度约为100 μ m。1妈妈。在最佳条件下，在50mol%H_2 - 50mol%CO的混合气体中，氢气在渗透气体中的浓度高达99mol%。结果表明，Ni/CaNi_5膜的渗透速率<4.2>是Ni/CaNi_5膜的2倍，X射线光电子能谱测试表明，非晶态Ca-Ni合金膜对H_2混合气体中的有害CO具有良好的抵抗能力。

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.