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以Ｆｅ３＋（Ｃｒ３＋）／Ｆｅ２＋混合离子和氨水为原料，用共沉淀方法制备出γ－Ｆｅ２Ｏ３（Ｆｅ３Ｏ４）晶型的铁格中变催化剂，在３２５℃、５００ｈ－１、汽气比２：１条件下，ＣＯ转化率高达９７％．用高分辨透射电镜对还原后催化剂形貌的观察表明，其粒子大小分布比由α－Ｆｅ２Ｏ３还原所得Ｆｅ３Ｏ４更均匀．用该方法制备的铁路中变催化剂，已成功地在中小型合成氨厂中使用．
The iron-cored transition catalyst with γ-Fe2O3 (Fe3O4) crystal was prepared by coprecipitation method with Fe3 + (Cr3 +) / Fe2 + mixed ions and ammonia as raw materials. Under the CO conversion up to 97%. Observation of the morphology of the reduced catalyst by high-resolution transmission electron microscopy showed that the particle size distribution is more uniform than the Fe3O4 reduced by α-Fe2O3. The railway catalyst prepared by this method has been successfully used in small and medium sized ammonia plants.