A series of Mg-Fe mixed oxides prepared from thermal decomposition of hydrotalcite-like materials was studied. Fixing other variables, the effect of Mg/Fe ratio varying nominally from 1 to 10 on physicochemical and acido-basic properties was originally examined. Materials were characterized by experimental techniques XRD, N2-physisorption, CO2 and NH3-TPD. Obtained oxides were tested as new catalysts for the aldol condensation of furfural with acetone, as the reaction to obtain long carbon chain products and diesel fuel precursors.