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Nanocomposite copper-ceria catalysts for low temperature or near-ambient temperature catalysis and methods for making such catalysts

  • US 7,491,675 B2
  • Filed: 09/28/2004
  • Issued: 02/17/2009
  • Est. Priority Date: 12/09/2002
  • Status: Expired due to Fees
First Claim
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1. A method for making a nanocomposite copper-ceria catalyst, comprising:

  • (i) combining ceria nanoparticles in an aqueous suspension with copper 2,4-pentanedionate to form a slurry;

    (ii) heating the slurry formed in step (i) under an inert gas atmosphere or an oxygen-argon atmosphere, at a temperature and for a time sufficient to cause decomposition of the copper 2,4-pentanedionate to form copper nanoparticles and/or copper oxide nanoparticles that are combined with the ceria nanoparticles; and

    (iii) optionally, subjecting the product formed in step (ii) to a heat treatment process under conditions effective to convert at least some of the copper nanoparticles to copper oxide nanoparticles;

    wherein the nanocomposite copper-ceria catalyst produced comprises copper oxide nanoparticles, copper nanoparticles, or a mixture thereof combined with the ceria nanoparticles.

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