【摘要】 考察了助剂CuO和K₂O对沉淀铁F-T合成催化剂物化性能的影响。XRD结果表明,该沉淀铁主体物相为α-Fe₂O₃。TEM和SEM表明,其微观具有椭园形比较规则的晶粒,K₂O的加入影响晶粒的大小和形状,催化剂表面凹凸不平且富孔型。TPR数据表明,助剂CuO可降低α-Fe₂O₃的还原温度,而K₂O却起相反作用。稳态化学吸附曲线表明,K₂O的存在有利于CO吸附,并促进链增长,而Cu助剂却对H₂表现出良好的吸附能力。CO+H₂合成反应的结果和化学吸附的数据相吻合,两者对产物组成均存在影响。更多还原

【Abstract】 The influences of CuO and K₂O on the precipitated iron catalyst performances were examined in more detail via a series of model catalysts. The results from XRD,TEM and SEM showed that the bulk phase of the catalysts is α-Fe₂O₃,the micromorphology is composed of more regular crystals with ellipse-shape. The addition of K₂O affects the size and shape of the crystal. The surface of the catalysts is rich-porous, convex and concave. The TPR data revealed that promotor CuO benefits the initial reduction of α-Fe₂O₃, whereas K₂O inhibits this function. The curves of steady chemisorption indicated that the presence of K₂O profits CO chemisorption and chain growth, CuO showes stronger H₂ chemisorption capacity. The results of CO+H₂ synthesis reaction well agreed with chemisorption data. The addition of K₂O and CuO obviously influences the product distribution.更多还原