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由复合物控制降解法制得的Fe-Mn超细粒子催化剂同时具有高的CO转化率和较高的低碳烯烃选择性,并能一定程度地抑制甲烷和高沸点烃的生成。反应初期催化剂的活性相是在不断变化的,导致了F-T活性和选择性随反应时间的不断改变。类尖晶石相(Mn_xFe_(3-x)O_4)是高转化率条件下稳定的F-T活性相。在稳态条件下,Mn主要以MnCO_3形式存在,它与铁物相紧密接触可以显著提高低碳烯烃选择性和降低甲烷选择性。
The Fe-Mn ultrafine particle catalyst prepared by the composite controlled degradation method has high CO conversion and high selectivity to light olefins, and can inhibit the formation of methane and high-boiling hydrocarbons to a certain extent. The initial phase of the reaction catalyst is constantly changing the active phase, resulting in the F-T activity and selectivity with the reaction time continuously changing. The spinel-like phase (Mn_xFe_ (3-x) O_4) is a stable F-T active phase with high conversion. Under steady-state conditions, Mn mainly exists in the form of MnCO_3. The close contact with iron phase can significantly improve the selectivity of light olefins and reduce the methane selectivity.