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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Bibliographic Details
Published in:	Journal of catalysis Vol. 281; no. 2; pp. 279 - 289
Main Authors:	Kondrat, Simon A., Davies, Thomas E., Zu, Zhongling, Boldrin, Paul, Bartley, Jonathan K., Carley, Albert F., Taylor, Stuart H., Rosseinsky, Matthew J., Hutchings, Graham J.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier Inc 25-07-2011 Elsevier Elsevier BV
Subjects:	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 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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Summary:	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.
Bibliography:	http://dx.doi.org/10.1016/j.jcat.2011.05.012
ISSN:	0021-9517 1090-2694
DOI:	10.1016/j.jcat.2011.05.012