Abstract
The hydrogen absorption and desorption properties of FeTi 1.14O 0.03 in impure hydrogen containing CO, CO 2 or oxygen were studied using either an automated apparatus for hydrogen absorption-desorption cycles combined with a mass spectrometer or gas chromatography. It was found that the effect of CO or CO 2 on the hydrogen absorption capacity and the hydrogen absorption-desorption kinetics of the alloy were more deleterious than that of oxygen. The hydrogen absorption capacity degraded after cycling in hydrogen containing CO or CO 2 was rapidly restored by cycling in pure hydrogen. However, restoration by cycling in pure hydrogen was more difficult after cycling in hydrogen containing oxygen. Gas analysis revealed that CO and CO 2 react with hydrogen to form CH 4 and C 2H 4, and that oxygen reacts with the alloy. It was concluded that the poisoning of oxygen is different from that of CO or CO 2. The mechanism of “surface poisoning” by these impurities is discussed.
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