Taking advantages of the high heat tolerance, large specific surface area, and rough surface morphology created by agglomeration of fine primary particles, a solvothermally prepared CeO2 aggregate, SiO2-CeO2 nano composite, and TiO2-CeO2 nanocomposite are proposed to be used as sintering-resistant catalyst supports in highly exothermic reactions. Well-dispersed Ru metal catalysts were deposited on support surfaces by the precipitation deposition method. The methanation of CO2 by H-2, which is a highly exothermic reaction, was selected as a probe reaction in order to evaluate the catalytic activity and sintering-resistant capability of Ru catalysts deposited on those prepared supports. As expected, the low temperature (150-200 degrees C) activity and CH4 production of the Ru catalysts on the prepared CeO2 aggregate and TiO2-CeO2 nanocomposites were better than those on commercial CeO2 aggregates. Moreover, long-term stability (400 degrees C, 24 h; 50-300 degrees C, 10 cycles) was also achieved in the catalysts on these prepared supports.