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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

DOI: 10.1002/cctc.201601603 DOI Help

Authors: Paul J. Smith (Cardiff Catalysis Institute, Cardiff University) , Simon A. Kondrat (Cardiff Catalysis Institute, Cardiff University) , James H. Carter (Cardiff Catalysis Institute, Cardiff University) , Philip A. Chater (Diamond Light Source) , Jonathan K. Bartley (Cardiff Catalysis Institute, Cardiff University) , Stuart Taylor (Cardiff Catalysis Institute, Cardiff University) , Michael S. Spencer (Cardiff Catalysis Institute, Cardiff University) , Graham J. Hutchings (Cardiff Catalysis Institute, Cardiff University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemcatchem , VOL 9 , PAGES 1621 - 1631

State: Published (Approved)
Published: May 2017

Abstract: A series of copper–zinc acetate and zincian georgeite precursors have been produced by supercritical CO2 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.

Journal Keywords: copper; gas-phase reactions; supercritical fluids; water; zinc

Subject Areas: Chemistry

Facility: Advanced Photon Source