Method of controlling Ce : Zr ratio in oxide nanoparticles

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A method of making a nanoparticle catalyst composition including : a single heating of an aqueous salt solution comprising a Ce, a Zr, a rare earth dopant, and a transition metal oxide precursor to provide nanoparticles, the nanoparticles have a compositional gradient comprised of a CeZrREO2, where RE is a rare earth, and the outer portion of the nanoparticles has a Ce : Zr ratio different from the inner portion of the nanoparticles. Also disclosed is a nanoparticle-catalyst composition and articles containing the composition, as defined herein.