Materials such as Fe-SBA-15, combining first-row earth abundant transition metals and mesoporous silica are of interest as heterogeneous catalysts. Strategies to incorporate Fe within mesoporous silica SBA-15 involve lowering the acidity of the synthesis gel which detrimentally effects the morphology of the final catalyst. Alternatively, multi-step chemical routes may be used to incorporate Fe which complicate production. Herein, direct addition of the salt additive diammonium phosphate to the synthesis gel of Fe-SBA-15 improves Fe content from 0.04 to 10.14 wt. % while maintaining a surface area >600 m² g⁻¹ by producing an iron phosphate phase throughout the mesoporous silica. Through speciation calculations in Visual MINTEQ, ICP-AES, N₂ physisorption, HRTEM, EDS, ⁵⁷Fe Mössbauer, SAXS, and XRD we observed a well-ordered mesoporous pore structure consisting of SiO₂ with dispersed Fe and P species which may exist as mesoporous FePO₄ sites.

诸如Fe-SBA-15这样的材料，结合了第一排富含地球的过渡金属和中孔二氧化硅，已成为非均相催化剂。将Fe掺入中孔二氧化硅SBA-15中的策略包括降低合成凝胶的酸度，这不利地影响了最终催化剂的形态。或者，可使用多步化学路线掺入使生产复杂的铁。在此，将盐添加剂磷酸氢二铵直接添加到Fe-SBA-15的合成凝胶中可将Fe含量从0.04重量％提高至10.14重量％。 通过在整个介孔二氧化硅中产生磷酸铁相来保持表面积大于600 m ²  g ^-1。通过Visual MINTEQ，ICP-AES，N _2中的物种计算通过物理吸附，HRTEM，EDS，⁵⁷ FeMössbauer，SAXS和XRD，我们观察到由SiO ₂组成的有序介孔结构，其中SiO ₂具有分散的Fe和P物种，可能以介孔FePO ₄位点存在。