Cerium, palladium and rhodium and selected from organic colloidal dispersion of the element, and i

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The inventive colloidal dispersion comprised cerium compound particles, an acid and an organic phase and is characterized in that it also comprises a compound of at least one element selected from rhodium and palladium. According to variants, the dispersion comprises particles of a compound of cerium, another rare earth and/or iron. The inventive dispersion can be used as an additive to diesel fuels for diesel engines