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中文摘要：
采用低温N2吸附、H2-TPR、CO2-TPD、MES、XRD，考察了K的加入顺序对两组微球状费托（F-T）合成Fe／Cu／K／SiO2催化剂的织构性质、还原行为、碳化行为、物相变化以及反应性能的影响。结果表明，K的加入顺序对催化剂的织构性质影响很小。先加Si后加K的催化剂具有较强的表面碱性，抑制催化剂在H2气氛下的初始还原，但促进了催化剂的碳化，且在浆态床F-T反应中表现出良好的反应稳定性，较高的FTS反应活性，较低的甲烷选择性以及较高的重质烃和烯烃选择性，表现出良好的工业应用前景。
英文摘要：
The effects of adding order of K on the textural properties, reduction behavior, phase transformation, surface basicity and slurry Fischer-Tropsch synthesis （FTS） performances over the spherical Fe-Cu-K-SiO2 catalysts were studied by using N2 physical adsorption, H2 temperature-programmed reduction （TPR）, CO2 temperature-programmed desorption （TPD）, Mossbauer spectroscopy and X-ray diffraction （XRD）. The results indicated that adding order of K could affect the textural properties very slight. The catalysts with later addition of K have stronger surface basicity, which could inhibit the H2 reduction of Fe2O3 → Fe3O4 but promote carburization of the catalyst. The catalysts with later addition of K show better reaction stability, higher FTS activity, lower CH4 selectivity and higher selectivity of olefin and heavy hydrocarbon. The results indicate that the later addition of K should be a better choice for Fe-Cu-K-SiO2 catalyst preparation.
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