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The effect of support morphology and impregnation medium on the activity of Cu/CeO 2 catalysts in the water gas shift reaction was investigated. Steady-state reaction experiments showed that the catalysts supported over CeO 2 nanoparticles achieved significantly higher CO conversions than catalysts supported over nanorods, which achieved only marginally higher conversions than the bare support. The catalysts were characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, N 2 O chemisorption, and H 2 -temperature-programmed reduction. Characterization of the catalysts showed that copper dispersion and catalytic activity were strongly correlated. Copper was observed to be better dispersed over CeO 2 nanoparticles, whereas larger, crystalline CuO domains with properties closer to that of bulk CuO were identified over CeO 2 nanorods. The finely dispersed copper species constitute the active sites for the WGS reaction over Cu/CeO 2 catalysts.

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