The natural mineral dolomite has been calcined and impregnated with Ti-,Zr-, Al-nanoparticle suspensions with the aim of improving the cyclic stabilities in high temperature CO2 sorption processes. After impregnation and subsequent calcination the materials were characterized by N-2 adsorption (BET surface area and micropore volume) and powder X-Ray diffraction while the cyclic performance in CO2 sorption processes was evaluated by breakthrough measurements: 30 cycles with sorption in 10% dry CO2 at 600 degrees C and regeneration at 850 degrees C in N-2 were run on each sample. (C) 2013 The Authors. Published by Elsevier Ltd.