Preparation of fused iron catalysts

1 Technology and Equipments for the Preparation of Fused Iron Catalysts 

Presently, the Fe-based ammonia synthesis catalysts used in industry are produced by traditional molten method, and are also known as fused iron catalysts. The advantages of molten method include simple processes, easy operation, low cost and excellent performance of product. Even though there are some differences in the chemical composition and catalytic performance of various types of fused iron catalysts, their manufacture process is mainly the same as follow. 12 

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Fig. 4.3 Situation of fused slurry flowing into the cooling trough during preparation of fused iron catalyst...

In Chapter 3, the authors proposed the single-phase principle of the preparation of fused iron catalyst. It is clearly pointed out that high catalytic activity can be achieved when wiistite or magnetite phase exists separately in the catalyst. When wiistite and magnetite coexist in the catalyst, the catal3dic activity is always low. In the FeO phase region, the activity of the catalyst decreases due to the formation of a new phase a-Fe in the case of f > 11. 

Furthermore, the following solid-solid reactions may occur during the preparation of fused iron catalysts. 

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