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Supercritical antisolvent precipitation of amorphous copper–zinc georgeite and acetate precursors for the preparation of ambient‐pressure water‐gas‐shift copper/zinc oxide catalysts

Smith, Paul J., Kondrat, Simon A., Carter, James H., Chater, Philip A., Bartley, Jonathan K., Taylor, Stuart H., Spencer, Michael S. and Hutchings, Graham J. 2017. Supercritical antisolvent precipitation of amorphous copper–zinc georgeite and acetate precursors for the preparation of ambient‐pressure water‐gas‐shift copper/zinc oxide catalysts. ChemCatChem 9 (9) , pp. 1621-1631. 10.1002/cctc.201601603

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Abstract

A series of copper-zinc acetate and zincian georgeite precursors have been produced by supercritical CO2 anti-solvent (SAS) precipitation as precursors to Cu/ZnO catalysts for the water gas shift (WGS) reaction. The amorphous materials were prepared by varying the water/ethanol volumetric ratio in the initial metal acetate solutions. Water addition promoted georgeite formation at the expense of mixed metal acetates, which are formed in the absence of the water co-solvent. Optimum SAS precipitation occurs without water to give high surface areas, whilst a high water content gives inferior surface areas and copper-zinc segregation. Calcination of the acetates is exothermic, producing a mixture of metal oxides with high crystallinity. However, thermal decomposition of zincian georgeite resulted in highly dispersed CuO and ZnO crystallites with poor structural order. The georgeite-derived catalysts give superior WGS performance in comparison to the acetate-derived catalysts, which is attributed to enhanced copper-zinc interactions that originate from the precursor.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Uncontrolled Keywords: copper; gas-phase reactions; supercritical fluids; water; zinc
Additional Information: PDF uploaded in accordance with publisher's policies at http://www.sherpa.ac.uk/romeo/issn/1867-3880/ (accessed 17.3.17).
Publisher: Wiley
ISSN: 1867-3880
Funders: UK Catalysis Hub, the EPSRC and ERC
Date of First Compliant Deposit: 16 March 2017
Date of Acceptance: 13 February 2017
Last Modified: 08 Sep 2020 15:01
URI: http://orca.cf.ac.uk/id/eprint/99098

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