The effect of heat treatment on phase formation of copper manganese oxide: Influence on catalytic activity for ambient temperature carbon monoxide oxidation
The auto-reduction of copper and manganese acetates has been manipulated, to tailor specific Cu/Mn/O phases for the purpose of investigating their relation to activity for CO oxidation. A range of phases were produced from Hopcalite to discrete metallic copper particles supported by manganese oxide....
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| Published in: | Journal of catalysis Vol. 281; no. 2; pp. 279 - 289 |
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| Main Authors: | , , , , , , , , |
| Format: | Journal Article |
| Language: | English |
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Elsevier Inc
25-07-2011
Elsevier Elsevier BV |
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| Abstract | The auto-reduction of copper and manganese acetates has been manipulated, to tailor specific Cu/Mn/O phases for the purpose of investigating their relation to activity for CO oxidation. A range of phases were produced from Hopcalite to discrete metallic copper particles supported by manganese oxide. The Hopcalite spinel phase was found to be required for the activity, while copper and manganese oxides were found to be inactive.
[Display omitted]
► The use of supercritical anti-solvent precipitation allows for the formation of well-mixed metal acetates. ► The auto-reduction of Cu and Mn acetates has been controlled to tailor specific phase formation for synthesising catalysts. ► MnO
x
-supported Cu nanoparticles or CuMnO
x
spinel structures were formed, depending on the heat treatment conditions. ► The ability to tune oxidation state and phase composition of catalysts is a key preparation parameter for controlling the activity.
The auto-reduction of copper and manganese acetates has been investigated using
in situ X-ray diffraction and thermogravimetric analysis, with the intention of manipulating the phenomena to tailor specific phase formation for synthesising catalysts. Subsequently catalysts prepared in this controlled manner were evaluated for ambient temperature CO oxidation. The decomposition of mixed copper and manganese acetate systems was controlled to form MnO
x
-supported Cu or CuMnO
x
spinel structures, depending on the oxygen concentration and flow conditions during the heat treatment. Catalyst precursors were prepared by physical grinding and by a supercritical CO
2 anti-solvent precipitation process. The use of supercritical anti-solvent precipitation allows for the formation of well-mixed metal acetates that decompose to form active spinel CO-oxidation catalysts or small copper nano-particles supported on MnO
x
, depending on the oxygen content of the heat treatment atmosphere. The ability to tune oxidation state and phase composition of catalysts is a key preparation parameter for controlling the activity and provides insight into the active sites for CO oxidation. |
|---|---|
| AbstractList | The auto-reduction of copper and manganese acetates has been manipulated, to tailor specific Cu/Mn/O phases for the purpose of investigating their relation to activity for CO oxidation. A range of phases were produced from Hopcalite to discrete metallic copper particles supported by manganese oxide. The Hopcalite spinel phase was found to be required for the activity, while copper and manganese oxides were found to be inactive. Display Omitted Highlights The use of supercritical anti-solvent precipitation allows for the formation of well-mixed metal acetates. The auto-reduction of Cu and Mn acetates has been controlled to tailor specific phase formation for synthesising catalysts. MnO x -supported Cu nanoparticles or CuMnO x spinel structures were formed, depending on the heat treatment conditions. The ability to tune oxidation state and phase composition of catalysts is a key preparation parameter for controlling the activity. The auto-reduction of copper and manganese acetates has been investigated using in situ X-ray diffraction and thermogravimetric analysis, with the intention of manipulating the phenomena to tailor specific phase formation for synthesising catalysts. Subsequently catalysts prepared in this controlled manner were evaluated for ambient temperature CO oxidation. The decomposition of mixed copper and manganese acetate systems was controlled to form MnO x -supported Cu or CuMnO x spinel structures, depending on the oxygen concentration and flow conditions during the heat treatment. Catalyst precursors were prepared by physical grinding and by a supercritical CO2 anti-solvent precipitation process. The use of supercritical anti-solvent precipitation allows for the formation of well-mixed metal acetates that decompose to form active spinel CO-oxidation catalysts or small copper nano-particles supported on MnO x , depending on the oxygen content of the heat treatment atmosphere. The ability to tune oxidation state and phase composition of catalysts is a key preparation parameter for controlling the activity and provides insight into the active sites for CO oxidation. [PUBLICATION ABSTRACT] The auto-reduction of copper and manganese acetates has been manipulated, to tailor specific Cu/Mn/O phases for the purpose of investigating their relation to activity for CO oxidation. A range of phases were produced from Hopcalite to discrete metallic copper particles supported by manganese oxide. The Hopcalite spinel phase was found to be required for the activity, while copper and manganese oxides were found to be inactive. [Display omitted] ► The use of supercritical anti-solvent precipitation allows for the formation of well-mixed metal acetates. ► The auto-reduction of Cu and Mn acetates has been controlled to tailor specific phase formation for synthesising catalysts. ► MnO x -supported Cu nanoparticles or CuMnO x spinel structures were formed, depending on the heat treatment conditions. ► The ability to tune oxidation state and phase composition of catalysts is a key preparation parameter for controlling the activity. The auto-reduction of copper and manganese acetates has been investigated using in situ X-ray diffraction and thermogravimetric analysis, with the intention of manipulating the phenomena to tailor specific phase formation for synthesising catalysts. Subsequently catalysts prepared in this controlled manner were evaluated for ambient temperature CO oxidation. The decomposition of mixed copper and manganese acetate systems was controlled to form MnO x -supported Cu or CuMnO x spinel structures, depending on the oxygen concentration and flow conditions during the heat treatment. Catalyst precursors were prepared by physical grinding and by a supercritical CO 2 anti-solvent precipitation process. The use of supercritical anti-solvent precipitation allows for the formation of well-mixed metal acetates that decompose to form active spinel CO-oxidation catalysts or small copper nano-particles supported on MnO x , depending on the oxygen content of the heat treatment atmosphere. The ability to tune oxidation state and phase composition of catalysts is a key preparation parameter for controlling the activity and provides insight into the active sites for CO oxidation. The auto-reduction of copper and manganese acetates has been investigated using in situ X-ray diffraction and thermogravimetric analysis, with the intention of manipulating the phenomena to tailor specific phase formation for synthesising catalysts. Subsequently catalysts prepared in this controlled manner were evaluated for ambient temperature CO oxidation. The decomposition of mixed copper and manganese acetate systems was controlled to form MnOₓ-supported Cu or CuMnOₓ spinel structures, depending on the oxygen concentration and flow conditions during the heat treatment. Catalyst precursors were prepared by physical grinding and by a supercritical CO₂ anti-solvent precipitation process. The use of supercritical anti-solvent precipitation allows for the formation of well-mixed metal acetates that decompose to form active spinel CO-oxidation catalysts or small copper nano-particles supported on MnOₓ, depending on the oxygen content of the heat treatment atmosphere. The ability to tune oxidation state and phase composition of catalysts is a key preparation parameter for controlling the activity and provides insight into the active sites for CO oxidation. |
| Author | Taylor, Stuart H. Boldrin, Paul Kondrat, Simon A. Carley, Albert F. Bartley, Jonathan K. Rosseinsky, Matthew J. Davies, Thomas E. Zu, Zhongling Hutchings, Graham J. |
| Author_xml | – sequence: 1 givenname: Simon A. surname: Kondrat fullname: Kondrat, Simon A. organization: Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK – sequence: 2 givenname: Thomas E. surname: Davies fullname: Davies, Thomas E. organization: Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK – sequence: 3 givenname: Zhongling surname: Zu fullname: Zu, Zhongling organization: Department of Chemistry, Crown Street, University of Liverpool, Liverpool L69 7ZD, UK – sequence: 4 givenname: Paul surname: Boldrin fullname: Boldrin, Paul organization: Department of Chemistry, Crown Street, University of Liverpool, Liverpool L69 7ZD, UK – sequence: 5 givenname: Jonathan K. surname: Bartley fullname: Bartley, Jonathan K. organization: Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK – sequence: 6 givenname: Albert F. surname: Carley fullname: Carley, Albert F. organization: Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK – sequence: 7 givenname: Stuart H. surname: Taylor fullname: Taylor, Stuart H. organization: Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK – sequence: 8 givenname: Matthew J. surname: Rosseinsky fullname: Rosseinsky, Matthew J. organization: Department of Chemistry, Crown Street, University of Liverpool, Liverpool L69 7ZD, UK – sequence: 9 givenname: Graham J. surname: Hutchings fullname: Hutchings, Graham J. email: hutch@cardiff.ac.uk organization: Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK |
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| Copyright | 2011 Elsevier Inc. 2015 INIST-CNRS Copyright © 2011 Elsevier B.V. All rights reserved. |
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| Keywords | Copper manganese oxide Acetate decomposition Hopcalite CO oxidation Heat treatment Support In situ Decomposition Precursor Grinding Particle Chemical reduction Precipitation Oxidation Carbon monoxide Copper Structure Oxygen Catalytic reaction Phase composition Transition element compounds Thermogravimetry Acetate X ray diffraction Heterogeneous catalysis Manganese oxides Spinel Spinels Atmosphere Preparation Supercritical solvent Copper oxide Catalyst Manganese |
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| Snippet | The auto-reduction of copper and manganese acetates has been manipulated, to tailor specific Cu/Mn/O phases for the purpose of investigating their relation to... The auto-reduction of copper and manganese acetates has been investigated using in situ X-ray diffraction and thermogravimetric analysis, with the intention of... |
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| SubjectTerms | Acetate decomposition acetates active sites ambient temperature carbon dioxide Carbon monoxide Catalysis Catalysts catalytic activity Catalytic oxidation Chemistry CO oxidation Copper Copper manganese oxide Exact sciences and technology General and physical chemistry grinding Heat treating heat treatment Hopcalite manganese Manganese compounds manganese oxides nanoparticles oxidation oxygen Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry thermogravimetry X-ray diffraction |
| Title | The effect of heat treatment on phase formation of copper manganese oxide: Influence on catalytic activity for ambient temperature carbon monoxide oxidation |
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