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Cerium incorporated ordered manganese oxide OMS-2 materials: Improved catalysts for wet oxidation of phenol compounds
Balasubramanian Viswanathan, Thirukkallam Kanthadai Varadarajan
Published in
2005
Volume: 59
   
Issue: 1-2
Pages: 91 - 98
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. © 2005 Elsevier B.V. All rights reserved.
About the journal
JournalApplied Catalysis B: Environmental
ISSN09263373
Open AccessNo
Concepts (21)
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    Adsorption
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    CATALYSTS
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    Cerium
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    Crystallization
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    Impregnation
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    Ion exchange
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    Morphology
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    Oxidation
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    Phenols
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    Precipitation (chemical)
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    Redox reactions
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    Synthesis (chemical)
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    Textures
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    Thermogravimetric analysis
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    Transmission electron microscopy
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    Wastewater treatment
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    HYDROTHERMAL CRYSTALLIZATION
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    MANGANESE OXIDES
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    MANGANESE SULFATE
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    Wet oxidation
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    Manganese compounds