Synthesis of highly dispersed iron species within mesoporous (Al-)SBA-15 silica as efficient heterogeneous Fenton-type catalysts

Iron and iron-aluminium containing ordered SBA-15 silica catalysts were synthesized for the first time at relatively high iron content (Si/Fe molar ratio down to ∼21) using an adapted two-step pH-adjustment approach needed for the incorporation of heteroatom species in the mesostructure. The pH appl...

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Bibliographic Details
Published in:Microporous and mesoporous materials 2017-03, Vol.241, p.326-337
Main Authors: Mazilu, Irina, Ciotonea, Carmen, Chirieac, Alexandru, Dragoi, Brindusa, Catrinescu, Cezar, Ungureanu, Adrian, Petit, Sabine, Royer, Sébastien, Dumitriu, Emil
Format: Article
Language:English
Subjects:
Aluminium
Catalysis
Chemical Sciences
Heterogeneous Fenton catalysts
Iron
Mesoporous SBA-15
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Summary:Iron and iron-aluminium containing ordered SBA-15 silica catalysts were synthesized for the first time at relatively high iron content (Si/Fe molar ratio down to ∼21) using an adapted two-step pH-adjustment approach needed for the incorporation of heteroatom species in the mesostructure. The pH applied for the second step of synthesis significantly affected (i) the content of inserted iron and (ii) the state of iron species. Thus, under acidic conditions, the iron heteroatoms were partly incorporated within the mesoporous SBA-15 structure. The solids displayed a moderate activity in the Fenton-type peroxidation of Reactive Red 120 azo dye owing to the low density of active sites for H2O2 activation. Nearly complete iron incorporation was achieved at slightly basic pH with iron mostly presented as isolated and/or highly dispersed species. Furthermore, it was observed that the co-addition of aluminium to iron significantly promoted stabilization of iron species in isolated and/or highly dispersed state, which exhibited improved catalytic properties for the dye degradation with fast cleavage of azo-chromophore into intermediates and high mineralization level. [Display omitted] •Investigation of pH adjustment during synthesis of iron-doped (Al-)SBA-15 catalysts.•The amount of iron incorporated in the walls of SBA-15 silica increased with pH.•Presence of aluminium promoted stabilization of iron as highly dispersed species.•Successful use in Fenton-type reaction using hydrogen peroxide as oxidant.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2016.12.024