Use of a catalyst comprising a mixed oxide in a basic heterogeneous catalyzed chemical reaction e.g.

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The present invention relates to the use of rare earth metal-containing mixed oxide catalysts for basic heterogeneously catalyzed preparing a chemical compound, in particular for the production of fatty acid alkyl esters by transesterification of triglycerides and for the production of base-catalysed α, β-unsaturated carbonyl compounds by aldol condensation of carbonyl compounds. Also the present invention relates to rare earth metal-containing mixed oxide catalysts High BET surface as well as a process for producing said mixed oxide catalysts.