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以初湿浸渍法为基础,柠檬酸为分散剂,制备出Fe2O3在SiO2载体上高度分散的F-T催化剂,通过N2吸脱附技术、X射线衍射、扫描透射电镜和程序升温还原对催化剂的结构,形貌及组成进行表征,结果表明,在柠檬酸分散作用下,浸渍过程中Fe离子与SiO2载体之间的静电吸附作用使Fe离子稳定、均匀地分散于SiO2表面,在烘干、焙烧过程中未发生团聚现象,形成高度分散、均匀的纳米颗粒,粒径平均尺寸为1.1nm。以F-T合成反应作为模型反应对催化活性进行表征,该法合成的催化剂表现出较优异的稳定性,反应500h后CO转化率保持在35.1%。
Based on the incipient wetness method, citric acid was used as the dispersant to prepare the FT catalyst with high dispersion of Fe2O3 on the SiO2 support. The structure, structure and structure of the catalyst were characterized by N2 adsorption-desorption, X-ray diffraction, scanning transmission electron microscopy and temperature programmed reduction. Morphology and composition were characterized. The results showed that under the action of citric acid dispersion, the electrostatic adsorption between the Fe ions and the SiO2 carrier during the impregnation enables the Fe ions to be stably and evenly dispersed on the SiO2 surface. During the drying and calcination process No agglomeration occurred to form highly dispersed and uniform nanoparticles with an average particle size of 1.1 nm. The catalytic activity was characterized by F-T synthesis reaction as a model reaction. The catalyst synthesized by this method showed excellent stability. The CO conversion remained at 35.1% after 500 h reaction.