Effect of aging on the CO oxidation properties of copper manganese oxides prepared by hydrolysis–coprecipitation using tetramethyl ammonium hydroxide

Hisahiro Einaga, Akihiro Kiya

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Copper manganese mixed oxides were prepared by a hydrolysis-coprecipitation method using tetramethyl ammonium hydroxide and calcined at 573–873 K. The effect of aging treatment after the coprecipitation process on the catalytic properties of the calcined mixed oxides for CO oxidation was investigated. XRD and EXAFS studies showed that spinel phases were mainly formed in the aged catalysts and the degree of disorder in the Cu–Mn spinel oxide phases increased. The aging treatment suppressed the formation of crystallites of mixed oxides, but the treatment promoted the crystallization of impurity CuO phase. The aged catalyst exhibited higher activity for CO oxidation than the unaged catalysts. The optimum calcination temperature for obtaining the highest activity was changed by aging treatment. Refluxing during the aging treatment led to the detrimental effect on the CO oxidation activities.

Original languageEnglish
Pages (from-to)521-536
Number of pages16
JournalReaction Kinetics, Mechanisms and Catalysis
Volume117
Issue number2
DOIs
Publication statusPublished - Apr 1 2016

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Ammonium Hydroxide
Ammonium hydroxide
Manganese oxide
manganese oxides
copper oxides
Carbon Monoxide
Oxides
hydroxides
Copper
Aging of materials
mixed oxides
Oxidation
oxidation
Coprecipitation
Catalysts
catalysts
spinel
Manganese
Crystallization
Crystallites

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry

Cite this

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abstract = "Copper manganese mixed oxides were prepared by a hydrolysis-coprecipitation method using tetramethyl ammonium hydroxide and calcined at 573–873{\^A} K. The effect of aging treatment after the coprecipitation process on the catalytic properties of the calcined mixed oxides for CO oxidation was investigated. XRD and EXAFS studies showed that spinel phases were mainly formed in the aged catalysts and the degree of disorder in the Cu–Mn spinel oxide phases increased. The aging treatment suppressed the formation of crystallites of mixed oxides, but the treatment promoted the crystallization of impurity CuO phase. The aged catalyst exhibited higher activity for CO oxidation than the unaged catalysts. The optimum calcination temperature for obtaining the highest activity was changed by aging treatment. Refluxing during the aging treatment led to the detrimental effect on the CO oxidation activities.",
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AB - Copper manganese mixed oxides were prepared by a hydrolysis-coprecipitation method using tetramethyl ammonium hydroxide and calcined at 573–873 K. The effect of aging treatment after the coprecipitation process on the catalytic properties of the calcined mixed oxides for CO oxidation was investigated. XRD and EXAFS studies showed that spinel phases were mainly formed in the aged catalysts and the degree of disorder in the Cu–Mn spinel oxide phases increased. The aging treatment suppressed the formation of crystallites of mixed oxides, but the treatment promoted the crystallization of impurity CuO phase. The aged catalyst exhibited higher activity for CO oxidation than the unaged catalysts. The optimum calcination temperature for obtaining the highest activity was changed by aging treatment. Refluxing during the aging treatment led to the detrimental effect on the CO oxidation activities.

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