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The effect of heat treatment on phase formation of copper manganese oxide: Influence on catalytic activity for ambient temperature carbon monoxide oxidation

Kondrat, Simon A., Davies, Thomas Edward, Zu, Zhongling, Boldrin, Paul, Bartley, Jonathan Keith, Carley, Albert Frederick, Taylor, Stuart Hamilton, Rosseinsky, Matthew J. and Hutchings, Graham John 2011. The effect of heat treatment on phase formation of copper manganese oxide: Influence on catalytic activity for ambient temperature carbon monoxide oxidation. Journal of Catalysis 281 (2) , pp. 279-289. 10.1016/j.jcat.2011.05.012

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Abstract

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 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 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 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. © 2011 Elsevier Inc. All rights reserved.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Acetate decomposition; Active site; Anti-solvents; Autoreduction; Carbon monoxide oxidation; Catalyst precursors; CO oxidation; Copper nanoparticles; Flow condition; Hopcalite; In-situ; Manganese acetate; Metal acetate; Oxidation state; Oxygen concentrations; Oxygen content; Phase formations; Precipitation process; Preparation parameters; Spinel structure; Super-critical; Supercritical CO, Carbon dioxide; Carbon monoxide; Catalyst activity; Catalytic oxidation; Copper; Heat treatment; Manganese; Oxidation; Oxygen; Temperature; Thermogravimetric analysis; Volatile fatty acids; X ray diffraction; X ray diffraction analysis, Manganese oxide
Publisher: Elsevier
ISSN: 0021-9517
Last Modified: 12 Jun 2019 02:32
URI: http://orca-mwe.cf.ac.uk/id/eprint/10218

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