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考察了助剂CuO和K_2O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-Fe_2O_3。TEM和SEM表明,其微观具有椭园形比较规则的晶粒,K_2O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-Fe_2O_3的还原温度,而K_2O却起相反作用。稳态化学吸附曲线表明,K_2O的存在有利于CO吸附,并促进链增长,而Cu助剂却对H_2表现出良好的吸附能力。CO+H_2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。
The effects of CuO and K_2O on the physico-chemical properties of precipitated Fe-F catalysts were investigated. XRD results show that the precipitated iron host phase is α-Fe_2O_3. The results of TEM and SEM showed that the microstructure had regular ellipsoidal grains. The addition of K2O influenced the size and shape of the grains, and the surface of the catalyst was uneven and porous. TPR data show that CuO can reduce the reduction temperature α-Fe_2O_3, while K_2O has the opposite effect. The steady state chemisorption curve showed that the presence of K 2 O favored the adsorption of CO and promoted the chain growth, while the Cu promoter showed good adsorption capacity for H 2. The results of the CO + H 2 synthesis match well with the data of chemisorption, both of which affect the product composition.