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Iron Oxide Silica Derived from Sol-Gel Synthesis
Adi Darmawan1, Simon Smart2, Anne Julbe3
1FIMLab-Films and Inorganic Membrane Laboratory, School of Chemical Engineering, The University of Queensland, Brisbane Qld 4072, Australia. a.darmawan@uq.edu.au.
Materials (Basel, Switzerland)
|September 8, 2017
Summary
Iron oxides embedded in silica matrices stabilize porous structures during calcination. Higher iron content prevents silica matrix collapse, maintaining surface area and pore characteristics for potential molecular sieve applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Silica matrices are widely used in catalysis and separation.
- Controlling pore structure and surface area is crucial for material performance.
- Incorporating metal oxides can modify silica properties.
Purpose of the Study:
- To investigate the impact of iron oxide content and sol pH on silica matrix properties.
- To understand the structural changes during calcination.
- To evaluate the potential for creating iron oxide-silica molecular sieves.
Main Methods:
- Sol-gel synthesis using tetraethyl orthosilicate and iron nitrate nonahydrate.
- Homogeneous dispersion of iron oxide nanoparticles.
- Calcination at varying temperatures and compositions.
- Analysis of surface area, pore radius, and pore volume.
Main Results:
- Calcination reduced surface area and pore volume due to densification.
- Average pore radius remained constant (~10 Å) regardless of Fe/Si ratio or pH.
- High iron oxide content (up to 50% Fe/Si) at 700 °C maintained surface area.
- Iron oxides appeared to inhibit silica structure collapse during calcination.
Conclusions:
- Iron oxide incorporation significantly influences the thermal stability of silica matrices.
- The Fe/Si molar ratio is a more critical factor than sol pH for forming stable iron oxide-silica structures.
- These findings suggest potential for developing robust iron oxide-silica materials for molecular sieve applications.
