Abstract
A variety of experimental techniques including flow reactor studies, temperature-programmed oxidation, and transmission electron microscopy have been used to investigate the manner by which silver modifies the catalytic behavior of cobalt. For this purpose the growth of filamentous carbon along with the gas phase product distribution resulting from the decomposition of ethylene over cobalt and cobalt−silver particles at 600 °C has been used as a probe reaction. It was found that the incorporation of as little as 1% of silver into cobalt caused a increase of over an order of magnitude in the amount of carbon filaments produced compared to that formed on pure cobalt under the same experimental conditions. It is suggested that some of the observed enhancement in catalytic activity could be due to the existence of electronic perturbations of cobalt induced by the presence of silver that are manifested in modifications in the adsorption and subsequent decomposition characteristics of ethylene on the bimetallic...
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