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用不同浓度与不同pH值的硝酸铁水溶液和具有良好溶解性能的极性溶剂N,N—二甲基甲酰胺(DMF)制成的不同浓度的硝酸铁DMF溶液作为浸渍液,研究了不同结晶相、不同 成型颗粒和不同预处理条件下的TiO_2载体在其中的浸渍过程。通过ICP对Fe负载量的测定与相应的TEM照相结果的分析得到影响活性组分Fe在TiO_2载体上负载量几种因素的作用规律,并用TiO_2的表面化学以及离子交换和离子吸附理论对这些规律做了解释。有利于获得较高负载量的条件是:具有较高浓度和最佳pH值的水溶液型浸渍液;具有良好极性的溶剂配制成的较高浓度的浸渍液;结晶度高、表面积大和无需经干燥煅烧预处理的载体。
Different concentrations of ferric nitrate solution with different pH values and different polar solvents N, N-dimethyl formamide (DMF) with different pH values were used as the impregnating solution to study the effects of different crystallization Phase, different forming particles and different pretreatment conditions of TiO 2 carrier in which the impregnation process. The effect of Fe on the loading of Fe 2 O 3 supported by ICP on the loading of Fe and the corresponding TEM results was analyzed. The surface chemistry of TiO 2 and ion exchange and ion adsorption theory were used to analyze these rules Made an explanation The conditions favoring higher loadings are: aqueous solution impregnation solutions with higher concentrations and optimum pH; higher concentration impregnation solutions formulated with solvents of good polarity; high crystallinity, large surface area, The calcined pretreated carrier is dried.