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Title: Supercritical antisolvent precipitation of amorphous copper–zinc georgeite and acetate precursors for the preparation of ambient-pressure water-gas-shift copper/zinc oxide catalysts
Authors: Smith, Paul J.
Kondrat, Simon A.
Carter, James H.
Chater, Philip A.
Bartley, Jonathan K.
Taylor, Stuart H.
Spencer, Michael S.
Hutchings, Graham J.
Issue Date: 2017
Publisher: © The Authors. Published by Wiley
Citation: SMITH, P.J. ...et al., 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.
Abstract: © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim A series of copper–zinc acetate and zincian georgeite precursors have been produced by supercritical CO 2 antisolvent (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, whereas 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 to the acetate-derived catalysts, which is attributed to enhanced copper–zinc interactions that originate from the precursor.
Description: This is an Open Access Article. It is published by Wiley under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: This research was supported by the UK Catalysis Hub, the EPSRC and ERC (grants EP/K014714/1, EP/K014714/1, EP/K014668/1, EP/K014706/ 1, EP/H000925/1, EP/I019693/1, EPSRC Grant EP/L027240/1 and “After the Goldrush” ERC-2011-AdG-291319) .
Version: Published
DOI: 10.1002/cctc.201601603
URI: https://dspace.lboro.ac.uk/2134/32148
Publisher Link: https://doi.org/10.1002/cctc.201601603
ISSN: 1867-3880
Appears in Collections:Published Articles (Chemistry)

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