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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

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posted on 08.03.2018 by Paul J. Smith, Simon Kondrat, James H. Carter, Philip A. Chater, Jonathan K. Bartley, Stuart H. Taylor, Michael S. Spencer, Graham J. Hutchings
© 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.

Funding

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) .

History

School

  • Science

Department

  • Chemistry

Published in

ChemCatChem

Volume

9

Issue

9

Pages

1621 - 1631

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.

Publisher

© The Authors. Published by Wiley

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2017-02-15

Copyright date

2017

Notes

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/

ISSN

1867-3880

eISSN

1867-3899

Language

en

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