Abstract
The hydrogenation of CO over the oxygen-stabilized hydrogen-storage alloy FeTi 1.14O 0.03, catalytically activated by thermal treatment in pure hydrogen, was investigated by gas chromatography, X-ray diffractometry, X-ray photoelectron spectroscopy and pressure differential scanning calorimetry, paying attention to active sites and changes in the alloy before and after hydrogenation. It is concluded that hydrogen atoms available when the α solid solution is formed or when the β hydride is formed and decomposed, play a governing role in the hydrogenation, producing hydrocarbons such as CH 4 (predominant), C 2H 4 and n-C 4H 10 above the catalytically active alloy. However, it was also found that the catalytically active alloy is deactivated on repeated hydrogenation. This is caused by the re-formation at the alloy surface of an oxide layer(s) which progressively blocks the more active sites for hydrogenmolecule dissociation.
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