Alloying Co with Ni is effective for enhancing the activity for CO hydrogenation as well as the selectivity to gasoline. Infrared spectra of adsorbed NO and XPS spectra for the 3p 3 2 Orbital of Co and Ni suggest that Co in the alloy interacts electronically with Ni in the outer shell orbital, resulting in the creation of adsorption sites with a new electron density. As a result, alloying Co with Ni strengthens the hydrogen adsorption. Thus alloying Co with Ni allows hydrogen to compete more effectively for adsorption sites in the co-adsorption of CO and H2. Since the rate of H2D2 exchange on CO preadsorbed CoNi alloy shows a good correlation with the CO hydrogenation activity, the reactivity of adsorbed hydrogen in the presence of CO plays a decisive role in determining the activity for CO hydrogenation in this alloy system.
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