(Ce, Zr)O2 Solid Solutions for Three-Way Catalysts

Jean-Pierre Cuif; Gilbert Blanchard; Olivier Touret; Aline Seigneurin; Mike Marczi; Eric Quéméré

doi:10.4271/970463

1997-02-24

(Ce, Zr)O2 Solid Solutions for Three-Way Catalysts 970463

It has been recently shown that (Ce, Zr)O₂ mixed oxides provide improved catalytic performances compared to pure CeO₂. Cerium oxide is the active Oxygen Storage Capacity (OSC) component in three way catalysts. However, higher performances, including OSC enhancement, can be achieved with thermally stable solid solutions of Ce and Zr oxides. In the present paper, we describe the structure and the advantages of Ce rich (Ce, Zr)O₂ solid solutions and the improved catalytic properties of these materials when used in association with platinum. Various analytical techniques were used including thermo-reduction methods, OSC measurements, surface area measurements, XRD, HRTEM, XPS, and XANES/EXAFS.

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(Ce, Zr)O2 Solid Solutions for Three-Way Catalysts 970463

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