Abstract
Iron catalysts with and without a potassium promoter have been studied in a combined temperature-programmed reaction and flow microreactor system connected to a mass spectrometer. This arrangement has the advantage that sample characterization through temperature-programmed methods can be carried out alternating with measurements of synthesis reaction rates. The desorption studies demonstrate a significant shift of the N 2 desorption peak to lower temperatures with the addition of K to the catalyst. This change suggests a destabilization of dissociated nitrogen. The N 2 adsorption results are generally in good agreement with earlier studies of singly promoted catalysts. Thus the rate was found to be slow and activated. The addition of K has little effect on the temperature-programmed adsorption (TPA) curves, while for multiply promoted catalysts there is a significant shift of the main adsorption dip to lower temperatures. However, the adsorption was still activated even for this type of catalyst.
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