Iron oxidic species supported on silica SBA‐15 were synthesized with various iron loadings using two different Fe^III precursors. The effect of varying powder layer thickness during calcination on structural and solid‐state kinetic properties of Fe_xO_y/SBA‐15 samples was investigated. Calcination was conducted in thin (0.3 cm) or thick (1.3 cm) powder layer. Structural characterization of resulting Fe_xO_y/SBA‐15 samples was performed by nitrogen physisorption, X‐ray diffraction, and DR‐UV/Vis spectroscopy. Thick powder layer during calcination induced an increased species size independent of the precursor. However, a significantly more pronounced influence of calcination mode on species size was observed for the Fe^III nitrate precursor compared to the Fe^III citrate precursor. Temperature‐programmed reduction (TPR) experiments revealed distinct differences in reducibility and reduction mechanism dependent on calcination mode. Thick layer calcination of the samples obtained from Fe^III nitrate precursor resulted in more pronounced changes in TPR profiles compared to samples obtained from Fe^III citrate precursor. TPR traces were analyzed by model‐dependent Coats‐Redfern method and model‐independent Kissinger method. Differences in solid‐state kinetic properties of Fe_xO_y/SBA‐15 samples dependent on powder layer thickness during calcination correlated with differences in iron oxidic species size.

中文翻译：

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煅烧条件对 SBA-15 负载的氧化铁物质的结构和固态动力学性质的影响。

^{使用两种不同的 Fe III}前体合成了具有不同铁负载量的二氧化硅 SBA-15 负载的氧化铁物质。研究了煅烧过程中不同粉末层厚度对 Fe _x O _y /SBA-15 样品的结构和固态动力学性质的影响。煅烧在薄（0.3 cm）或厚（1.3 cm）粉末层中进行。通过氮物理吸附、X 射线衍射和 DR-UV/Vis 光谱对所得 Fe _x O _y /SBA-15 样品进行结构表征。煅烧过程中厚的粉末层导致物质尺寸增加，与前体无关。然而，与柠檬酸^{三价铁前体相比，硝酸三}价铁前体的煅烧模式对物质尺寸的影响明显更显着。程序升温还原（TPR）实验揭示了取决于煅烧模式的还原性和还原机制的明显差异。^{与从柠檬酸三}价铁前体获得的样品相比，从硝酸^三价铁前体获得的样品的厚层煅烧导致 TPR 曲线发生更显着的变化。TPR 迹线通过模型相关的 Coats-Redfern 方法和模型无关的 Kissinger 方法进行分析。_{Fe x} O _y /SBA-15 样品的固态动力学特性的差异取决于煅烧过程中粉末层的厚度，并且与氧化铁物质尺寸的差异相关。