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通过对铁铬催化剂S_8在反应条件下(350℃、水蒸汽:半水煤气=2:1、气流速度为250ml/hr.)的穆斯堡尔谱测定表明为Fe_(3-x)Cr_xO_4体系。550℃耐热处理后,顺磁部分增加,得到更多的小颗粒固溶体。提高气流速度还原不完全,有γ-Fe_2O_3形成。在该反应条件下γ-Fe_2O_3可视为α-Fe_2O_3还原成Fe_3O_4的中间相。小颗粒固溶体的增加导致催化剂活性的上升。
The Fe_ (3-x) Cr_xO_4 system was demonstrated by Mössbauer spectroscopy on the iron-chromium catalyst S_8 under the reaction conditions (350 ° C, water vapor: half-water gas = 2: 1, gas flow rate of 250 ml / hr. After the heat treatment at 550 ℃, the paramagnetic part is increased to obtain more small particle solid solution. Improve the air velocity reduction is not complete, there γ-Fe_2O_3 formation. Under the reaction conditions, γ-Fe_2O_3 can be regarded as the α-Fe_2O_3 reduction to Fe_3O_4 mesophase. The increase in small particle solid solution leads to an increase in catalyst activity.