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A series of Rh/SiO 2 samples promoted with CeO 2 have been prepared and used as catalyst in CO 2 methanation. Their behaviour has been compared to that of unpromoted Rh/SiO 2 and Rh/CeO 2 catalysts. The activity has been monitored under transient and steady-state conditions and the catalysts have been characterized using quantitative temperature programmed reduction,...