The hydrogen-deuterium exchange reaction was employed for studying the reactivity of adsorbed hydrogen on CoNi alloy. The infrared spectra of adsorbed NO indicates that the support oxide electronically interacts with the CONi alloy. Desorption measurements suggest that the electron density of the alloy greatly influences the surface coverage of hydrogen and carbon monoxide. The CO hydrogenation rate of CoNi alloy in the presence of CO was shown to be related to the H2D2 exchange rate. The dissociative adsorption of hydrogen in the presence of CO is of primary importance in determining the CO hydrogenation rate of the CoNi alloy system, since the preadsorbed CO species strongly hinder the hydrogen adsorption. A high surface concentration of active hydrogen in the presence of CO leads to high catalytic activity for CO hydrogenation on CoNi alloy.
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