Résumé : The present invention relates to a catalysator element comprising a mixed metal oxide compound for conversion of nitrogen oxides (NOx). The present invention further relates to methods for the preparation of the present mixed metal oxide compound for use in the present catalysator element and to exhaust systems for a combustion engine comprising the present catalysator element for conversion of (NOx) in exhaust gasses. Specifically, the present invention relates to a catalysator element for conversion of nitrogen oxides (NOx) comprised of a solid support coated with a calcined mixed metal oxide hydrotalcite-like compound, wherein said calcined mixed metal oxide hydrotalcite-like compound comprises at least one bivalent metal (M2+) and at least one trivalent metal (M3+).