Fe/SiO2 heterogeneous Fenton catalyst for continuous catalytic wet peroxide oxidation prepared in situ by grafting of iron released from LaFeO3

G. Satishkumar, M. V. Landau, T. Buzaglo, L. Frimet, M. Ferentz, R. Vidruk, F. Wagner, Y. Gal, M. Herskowitz

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Functionalization of silica-gel by immobilization of iron ions at its surface was carried out through a novel method - selective extraction-deposition (SED) in acidic solution using LaFeO3 orthoferrite with perovskite structure as a solid precursor. Isolated Fe-ions produced as a result of precursors decomposition in acidic aqueous solution were trapped by silica surface silanols. The presence of iron in the only one state of isolated surface ions over 2wt%Fe/SiO2 material at the Fe content corresponded to surface silanols concentration was confirmed using ESR, Mossbauer spectroscopy, UV Raman, FTIR and XPS techniques. Catalytic performance of 2wt% Fe/SiO2 was examined toward catalytic wet peroxide oxidation (CWPO) of phenol in up flow fixed bed reactor at pH 4, 80°C, LHSV 6h-1 with 200ppmw phenol and 1300ppmw hydrogen peroxide in water. It was demonstrated that mixing of LaFeO3 with silica-gel gives an advanced catalytic material with high activity (TOC removal of 90%) and stability without iron leaching. This effect is due to dynamic behavior of iron that includes its SED-leaching-condensation along the catalysts layer. In this case, the LaFeO3 has a multiple function-active catalytic component, precursor of iron ions and buffer controlling the pH along the catalysts layer.

Original languageEnglish
Pages (from-to)276-284
Number of pages9
JournalApplied Catalysis B: Environmental
Volume138-139
DOIs
StatePublished - 17 Jul 2013

Keywords

  • Isolated iron ions
  • LaFeO perovskite
  • Phenol wet peroxide oxidation
  • Selective extraction-deposition
  • Silica

Fingerprint

Dive into the research topics of 'Fe/SiO<sub>2</sub> heterogeneous Fenton catalyst for continuous catalytic wet peroxide oxidation prepared in situ by grafting of iron released from LaFeO<sub>3</sub>'. Together they form a unique fingerprint.

Cite this