PURE PHASE E/E' IRON CARBIDE CATALYST FOR FISCHER-TROPSCH SYNTHESIS REACTION, PREPARATION METHOD THEREOF AND FISCHER-TROPSCH SYNTHESIS PROCESS

The present disclosure relates to the field of Fischer-Tropsch synthesis reaction catalysts, and discloses a pure phase ε/ε′ iron carbide catalyst for Fischer-Tropsch synthesis reaction, a preparation method thereof and a Fischer-Tropsch synthesis process, wherein the method comprises the following steps: (1) subjecting the nanometer iron powder or a nano-powder iron compound capable of obtaining the nanometer iron powder through in-situ reduction and H2 to a surface purification treatment at the temperature of 250-510° C.; (2) pretreating the material obtained in the step (1) with H2 and CO at the temperature of 80-180° C., wherein the molar ratio of H2/CO is 1.2-2.8: 1; (3) carrying out carbide preparation with the material obtained in the step (2), H2 and CO at the temperature of 180-280° C., wherein the molar ratio of H2/CO is 1.0-3.0: 1. The preparation method has the advantages of simple and easily obtained raw materials, simple and convenient operation steps, being capable of preparing the 100% pure phase ε/ε40 iron carbide catalyst having lower selectivity of CO2 and CH4 and higher selectivity of effective products.