Abstract
They have investigated the effects of potassium and aluminum oxide on the synthesis of ammonia from nitrogen and hydrogen over model iron single-crystal catalysts at 20-atm reactant pressure. Elemental potassium does not remain on a Fe(100) surface under reaction conditions but a small amount of potassium can be stabilized by coadsorption with oxygen. The presence of the stabilized K + O has no effect on the rate of ammonia synthesis. Substantially more potassium can be stabilized at higher temperatures on Fe(100), Fe(111), and Fe(110) surfaces by coadsorption with aluminum oxide. The cooperative interaction between the potassium and oxidized aluminum seems to be due to compound formation. There is an inverse relationship between the rate of reaction and amount of aluminum oxide and potassium present on all three iron surfaces investigated.
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