Abstract
The catalytic activity of framework iron in MFI-type ferrisilicate was studied. The incorporation of Fe3+ ions in the tetrahedral framework of MFI-type ferrisilicate was investigated by means of Mössbauer spectroscopy. The derived Mössbauer parameter at room temperature clearly indicated the presence of Fe3+ ions in tetrahedral lattice sites. The catalytic activity of ferrisilicate was tested for the oxidation of CO with O2 at 673 K and was compared with the activities of iron-oxide-impregnated silicalite (FeOx/Sil) and Fe ion-exchanged ZSM-5 (FeZSM-5). The CO oxidation activity of the tetrahedrally coordinated Fe3+ in ferrisilicate was much lower than that of octahedrally coordinated Fe3+ in FeOx/Sil and Fe3+ in ion-exchange sites of FeZSM-5. Kinetic studies were performed on these catalysts at 623 K. On ferrisilicate, the reaction orders for CO and O2 were 1.0 and 1.1, respectively, while on FeOx and FeZSM-5 the reaction orders were 1.3 and 1.2 for CO, respectively, and near zero for O2 in both cases. For CO oxidation, both the activity and reaction mechanism on ferrisilicate differed markedly from those on FeOx/Sil and FeZSM-5.
| Original language | English |
|---|---|
| Pages (from-to) | 201-205 |
| Number of pages | 5 |
| Journal | Microporous Materials |
| Volume | 1 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Jun 1993 |
| Externally published | Yes |
Keywords
- CO oxidation
- MFI-type
- Mössbauer spectrum
- ferrisilicate
- kinetics
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Engineering(all)