The high temperature reduction at 773 K of Rh–CeO2 catalysts induced a transient Rh–CeO2 interaction which enhances the rate of CO and CO2 hydrogenation; however, the activity dropped rapidly as a result of formation of water, which reoxidised CeO2 –x, restoring the normal behaviour.
A. Trovarelli, C. de Leitenburg and G. Dolcetti, J. Chem. Soc., Chem. Commun., 1991, 472 DOI: 10.1039/C39910000472
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