Open AccessTHE SURFACE FEATURES OF THE POISONING OF LATHANIUM RICH MIXED RARE EARTH-NICKEL HYDROGEN STORAGE MATERIAL BY CO,O2 AND H2O
Author(s) -
虞心南,
张青哲,
谢侃,
齐上雪,
康瑾,
林彰达
Publication year - 1983
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.32.1333
Subject(s) - x ray photoelectron spectroscopy , hydrogen , nickel , carbon monoxide , materials science , oxygen , co poisoning , catalysis , transition metal , carbon fibers , analytical chemistry (journal) , chemical engineering , chemistry , metallurgy , environmental chemistry , composite material , composite number , biochemistry , organic chemistry , engineering
In this paper, we report the study on the poisoning of hydrogen storage material MlNi5 (Ml = La, Ce, Pr, Nd) by CO, O2, H2O using x-ray and ultra violet photoeletron Spectro-scopy (XPS and UPS), With increasing of the poisoning gas exposure, peak a (0.3eV) and peak b (1.2 eV) below EF in UPS show evident change, they decayed shift toward the higher BE side and form a shoulder gradually: While the peak c (6eV) and peak d (9.5 eV) shifted increase with gas exposure. The chemical states of poisoned material were identified by XPS technique.The MINi5 poisoned by oxygen was restcred by hydrogen at 300 ℃ and after regenerating we observed from UPS the increasing of a, b intensities.Similar results were obtained in MlNi5 material peisoned by carbon monoxide and water vapor and then heated in UHV and etched by Ar+.These results were further demonstrated by XPS. The experiment results provide information on the Charge-transfer between d-electron of transition metal nickel in MINi5 and free molecular orbital of poisoning gases. It is a base for understanding of poisoning and re-generating of surface catalysis in practical use.