LaNi5的硫化物中毒及其再生的表面研究

本文概括了氢气中的硫化物(如H₂S,SO₂和CS₂)对LaNi₅的表面中毒和再生。AES,XPS的分析表明,三种硫化物的中毒性质不同:H₂S中毒产生La₂S₃和NiS这样的表面化合物;SO₂和CS₂中毒分别发生化学吸附和物理吸附。此外,从Ni(2P_3/2)谱峰强度变化,表明了在LaNi关键词：

STUDY OF SURFACE POISONING AND REGENERATING ON LaNl5 BY SULPHIDES

This article is a brief summary of our study on poisoning and regenerating at the surface of LaNi₅ by impurities, which are H₂S, SO₂ and CS₂ contained in the hydrogen used. The AES, XPS analysises show that the feature of the poisoning for three sulfides are different: LaNi₅ poisoned by H₂S produces the surface compounds, such as La₂S₃ and NiS. The chemisorption and physisorption occured due to SO₂ and CS₂ poisoning respectively.In addition, surface catalystic property of active nickel on LaNi₅ can be shown by evalution of the changes in the intensity of nickel peak in the Ni(2p_3/2) spectrum. Pure hydrogen cycle method is effective for regeneration of LaNi₅ poisoned by SO₂ and CS₂, but this is not true for H₂S-poisoned samples. These results are very useful in explaining the mechanisms of rare earth intermetallic hydrides surface poisoning and regenerating.