Abstract
Studies of the effects of potassium on CO, CO/sub 2/, and hydrogen adsorptions on iron indicate that potassium promotion increases heats of adsorption of CO and H/sub 2/, enhances the rate of CO dissociation, increases CO saturation coverage, and decreases the CO sticking coefficient. The purpose of this work was to investigate the effects of potassium promoter and calcination of the stoichiometries and kinetics of CO, CO/sub 2/, and H/sub 2/ adsorptions on Fe/SiO/sub 2/ and to relate these effects to changes in the physical and chemical properties of the catalyst. The results reveal important differences in behavior for CO and H/sub 2/ adsorptions on precalcined Fe/SiO/sub 2/ and Fe/K/SiO/sub 2/ compared to the adsorptions on single crystal or polycrystalline iron, which may relate to changes in the surface and bulk properties of iron such as potassium coverage and extent of reduction. 33 references.
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