Abstract
Hydriding characteristics of fluorinated LaNi4.7Al0.3 in hydrogen containing CH4, CO2 and CO were investigated by cyclic absorption-desorption tests and the purification efficiency at temperatures ⩽353.2 K were examined. Fluorinated alloys showed excellent tolerance to impurities, especially to the extremely poisonous CO. The alloy without treatment was completely deactivated after only a few hydriding/dehydriding cycles in hydrogen containing 300 ppm or 1000 ppm CO. However, the degradation of the hydriding reaction rate and hydrogen capacity of the fluorinated alloy was small. The gas chromatography measurements on hydrogen released from fluorinated alloys showed that the purity was higher than 99.9999% after a few percent release of hydrogen even for a high concentration of CO at low temperature. Based on these results, it is believed that practical hydride-based hydrogen purification from gas mixtures may be realizable by using fluorinated alloys.
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