The deactivation of catalyst in the DIR-MCFC was reported to be improved by the substitutionof alternative supports like MgO-TiO₂ composite oxides. In this research, it was tried to investigate the synthesis and characteristics of the oxides. To form MgTiO₃ crystallite(geikielite) was more feasible than Mg₂TiO₄ crystallite(qandilite)as both calcination temperature and Ti content increased. In order to prepare more qnadilite, it was beneficial to use magnesium acetate as a precursor with higher content than stoichiometry. The catalysts which had the Mg/Ti ratio in the region of 3 ~ 7, showed the best resistance to lithium. In the higher region of Mg content, the catalysts were easily deactivated like pure MgO.