Abstract
An in situ NMR technique was employed to study hydrogen adsorption on silica supported Ru-Group Ib bimetallic catalysts at pressures up to one atmosphere. Two different hydrogen-on-metal resonances, α and β, were observed. Addition of silver to Ru was found to greatly diminish the relative amount of the weakly bound β hydrogen. Since silver preferentially populates edge, corner and other defect-like sites, the weakly bound β was correlated with low coordinated metal atoms. The total hydrogen population on the catalyst remains approximately the same with the addition of copper. The difference in catalytic behavior of Ru, Ru-Cu and Ru-Ag is postulated to be due to the surface segregation induced structure sensitivity of the weakly bound β hydrogen.
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