Cerium incorporated ordered manganese oxide OMS-2 materials: Improved catalysts for wet oxidation of phenol compounds

M. Abecassis-Wolfovich, R. Jothiramalingam, M. V. Landau, M. Herskowitz, B. Viswanathan, T. K. Varadarajan

Research output: Contribution to journalArticlepeer-review

113 Scopus citations

Abstract

Cryptomelane type manganese oxide OMS-2 material was synthesized by redox reaction between potassium permanganate and manganese sulphate in acidic medium under reflux or hydrothermal crystallization conditions. Ce was added by ion-exchange, impregnation or directly at crystallization stage. The chemical composition, structure, texture, morphology and thermal stability of the materials were measured by EDX spectroscopy, XRD, N2-adsorption, SEM and TGA. Results of the catalytic wet oxidation of phenol at 100°C indicate best performance of the well-crystallized octahedral molecular sieve with cryptomelane structure where all the accessible potassium ions were exchanged for cerium cations. OMS-2 materials containing pure CeO2 phase and excess of active oxygen species had lower stability, activity and capacity for oxidative reactive adsorption of phenol. Implementation of Ce-exchanged crystalline OMS-2 catalyst improves the wastewater treatment capacity by a factor of 1.5-2 and 3 compared with co-precipitated Mn-Ce-oxide and activated carbon, respectively.

Original languageEnglish
Pages (from-to)91-98
Number of pages8
JournalApplied Catalysis B: Environmental
Volume59
Issue number1-2
DOIs
StatePublished - 8 Jul 2005

Keywords

  • Cryptomelane
  • Mn-Ce-oxide catalyst
  • Phenol
  • Wet oxidation

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science (all)
  • Process Chemistry and Technology

Fingerprint

Dive into the research topics of 'Cerium incorporated ordered manganese oxide OMS-2 materials: Improved catalysts for wet oxidation of phenol compounds'. Together they form a unique fingerprint.

Cite this