Abstract
Activities and selectivities of cobalt/alumina catalysts for CO hydrogenation were determined as a function of metal loading, reduction temperature, and preparation. Specific activities and average carbon numbers of the hydrocarbon product were found to vary significantly with metal loading, reduction temperature, and preparation. These changes were also found to be linearly correlated with changes in dispersion indicating that CO hydrogenation on Co Al 2O 3 is structure-sensitive. The changes in specific activity with dispersion can be explained by variations in the distribution of low and high coordination sites and by changes in the nature of adsorbed CO species available for reaction. High specific activity is apparently favored on sites to which CO is strongly coordinated. Variations in the average carbon number of the product can be explained by changes in the rate of termination relative to the rate of propagation. High-molecular-weight products are favored by catalysts having high rates of propagation and low rates of termination.
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