The role of potassium as a promoter in iron catalysts for ammonia synthesis

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Altenburg, K. and Bosch, H. and Ommen van, J.G. and Gellings, P.J. (1980) The role of potassium as a promoter in iron catalysts for ammonia synthesis. Journal of Catalysis, 66 (2). pp. 326-334. ISSN 0021-9517

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Abstract:Five ammonia synthesis catalysts, mainly differing in potassium content, were prepared from a commercial doubly promoted iron catalyst. The activities of these catalysts were measured at 350–450 °C and 5–200 atm. The experimental reaction rates were fitted to the modified Temkin rate equation. Increasing the potassium content from 0.1 to 3.8 wt% results in increasing the order in H2 from 0.7 to 1.5. The change from singly to doubly promoted behavior is gradual. The nature of catalysts with a relatively high K-content is changed, preventing the formation of NH (or NH2) groups so that N-atoms become the main species on the surface, which explains the higher order in H2.
Item Type:Article
Copyright:© 1980 Elsevier Science
Link to this item:http://purl.utwente.nl/publications/68487
Official URL:http://dx.doi.org/10.1016/0021-9517(80)90037-8
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