论文部分内容阅读
采用中频感应炉在氩气保护下制备稀土镍系AB5型贮氢合金和La-Mg-Ni系AB3型贮氢合金。利用H2、N2和CH4配制的混合气体来模拟工业尾气,对利用稀土贮氢合金分离混合气体中氢气的纯度、合金抗杂质气体毒化及抗粉化性能进行研究。结果表明,稀土镍系AB5型合金由CaCu5型结构组成,AB3型La-Mg-Ni系合金为多相结构,由(La,Mg)Ni3、LaNi5以及LaNi2型相组成。在分离混合气体中氢气时,贮氢合金均受到杂质气体的毒化,导致吸氢速率降低,吸氢量减少。La-Mg-Ni系合金的抗粉化性能好于LaNi5及其多元化合金。综合考虑分离氢气的纯度、合金的抗毒化及抗粉化性能,认为LaNi3.7Mn0.4Al0.3Fe0.4Co0.2合金分离氢气的效果较好,氢气纯度可以达到90.7%。
The rare earth nickel series AB5 hydrogen storage alloy and the La-Mg-Ni series AB3 hydrogen storage alloy were prepared under the protection of argon by a medium frequency induction furnace. The industrial tail gas was simulated by using mixed gases of H2, N2 and CH4 to study the purity of hydrogen in the mixed gas with rare earth hydrogen storage alloy, the poisoning resistance and anti-pulverization performance of alloy anti-impurity gas. The results show that the rare earth nickel type AB5 alloy is composed of CaCu5 type structure and the AB3 type La-Mg-Ni alloy is multiphase structure and consists of (La, Mg) Ni3, LaNi5 and LaNi2 phases. When separating the hydrogen in the mixed gas, the hydrogen storage alloy is poisoned by the impurity gas, resulting in a decrease of the hydrogen absorption rate and a decrease of the hydrogen absorption amount. La-Mg-Ni alloy anti-chalking performance better than LaNi5 and its multi-alloy. Considering the purity of hydrogen separation, anti-poisoning and anti-powdering properties of the alloy, it is considered that the hydrogen separation effect of LaNi3.7Mn0.4Al0.3Fe0.4Co0.2 alloy is better, and the hydrogen purity can reach 90.7%.