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Study of nanostructured ceria-supported transition metal catalysts through temperature-programmed reduction (TPR) techniques

Gorou Kyriaki-Anna

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Summary

Heterogeneous catalysis is an integral part of our society, as it plays a key role in many industrial processes, such as chemical production, petrochemicals, environmental protection and energy conversion processes. Among various catalytic materials, cerium oxide (CeO2) has gained significant attention due to its unique redox properties, high oxygen storage capacity, and oxygen mobility. The combination of ceria with transition metals, which are characterized by low cost and earth-abundance, is of particular importance for the development of low-cost catalytic materials with high activity, selectivity and thermal stability. In addition, suitable modification of size and/or shape of the nanoparticles can lead to catalytic materials with activities comparable or even superior to noble metal catalysts. Based on the rational design of metal oxide catalysts through advanced synthetic routes, in the present thesis, ceria nanoparticles of different morphologies (rods, cubes) were prepared through the hydrothermal method, and were used as supports for the addition of the cobalt oxide phase (Co3O4) through the wet impregnation method. Bare ceria supports as well as cobalt-ceria (Co/CeO2) catalysts were thoroughly characterized through various techniques (N2 adsorption-desorption at ‒196 oC, X-ray diffraction (XRD), Transmission electron microscopy (TEM), Temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS)) and they were catalytically evaluated in the oxidation of carbon monoxide (CO). In particular, in the context of the present thesis, the effect of ceria morphology on the surface chemistry and catalytic performance of the cobalt-ceria mixed oxides was studied. The results clearly demonstrated the fundamental role of ceria morphology in the porous, structural, redox and surface properties and consequently, in the catalytic performance of the cobalt-ceria catalysts.

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