中文摘要：

研究了一种改进的脱水方式对费托（F-T）合成铁基催化剂结构性质与催化性能的影响. 在 n（H2）/n（CO） = 0.67, WHSV = 1000 h^–1, p = 1.5 MPa 和 t = 250℃ 的条件下对催化剂进行了浆态床 F-T 合成反应性能评价实验, 并采用低温 N2 物理吸附、X 射线衍射、原子发射光谱、X 射线光电子能谱、氨程序升温脱附、穆斯堡尔谱和高分辨透射电镜等技术对催化剂进行了表征. 结果表明, 水处理和二次干燥得到的催化剂比表面积增加, 颗粒减小, 铁氧化物的分散程度增大, 其表面的 SiO2/Fe 比例明显减小; 该催化剂 F-T 合成反应活性有所增加; 表面酸性有所增强, 导致烃产物选择性向低碳数方向偏移.

英文摘要：

The effects of an improved dehydration way on structural properties and Fischer-Tropsch （F-T） synthesis performance of an iron-based catalyst were studied. The catalytic performance for F-T synthesis was investigated in a continuous stirred tank slurry reactor （CSTR） under the reaction conditions of n（H2）/n（CO） = 0.67, WHSV = 1000 h^-1, p = 1.5 MPa, and t = 250 ℃. The structural properties of the catalysts were characterized by N2 physical adsorption, X-ray diffraction, inductively coupled plasma atomic emission spectroscopy, X-ray photoelectron spectroscopy, NH3 temperature-programmed desorpfion, Mossbauer spectroscopy, and high-resolution transmission electron microscopy The results showed that the BET surface area and α-Fe2O3 dispersion were increased, and the particle size and the surface SiO2/Fe ratio of the catalyst were decreased after water pretreatment and twice drying. The catalyst exhibited high F-T synthesis activity. Moreover, the hydrocarbon selectivity shifted to lower carbon numbers for the catalyst underwent the improved dehydration way, ascribing to its increased surface acidity.