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Promoter effect on the reduction behavior of wuestite-based catalysts for ammonia synthesis

MPS-Authors
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Dembélé,  Kassiogé
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Girgsdies,  Frank
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Max Planck Institute for Chemical Energy Conversion, Department Heterogeneous Reactions;
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Lunkenbein,  Thomas
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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1-s2.0-S092058612100122X-main.pdf
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Citation

Folke, J., Dembélé, K., Girgsdies, F., Song, H., Eckert, R., Reitmeier, S., et al. (2021). Promoter effect on the reduction behavior of wuestite-based catalysts for ammonia synthesis. Catalysis Today. doi:10.1016/j.cattod.2021.03.013.


Cite as: http://hdl.handle.net/21.11116/0000-0008-52E4-A
Abstract
Ammonia synthesis remains one of the most important catalytic processes since it enables efficient hydrogen storage and provides the basis for the production of fertilizers. Herein, complementary bulk and local analytical techniques were combined to investigate the effect of selected promoters (Al, K, Ca) on the reduction of wuestite into α-iron and their catalytic performance for ammonia synthesis. The use of promoters appears to have a positive effect on the wuestite-derived catalyst in ammonia synthesis. The promoters seemingly act as a binder for wuestite grains and impede the reduction and disproportionation events of wuestite precursors resulting in an increased catalytic performance. This effect is associated with an increase of surface area and mesoporosity. The study delivers new insights into the interplay of structure and promoters in wuestite-based catalysts.