Abstract
The effect of ceria morphology, nanorods-NR and nanopolyhedra-NP on important kinetic parameters of the dry reforming of methane (DRM) over Ni/nano-ceria (dNi ∼20 nm) was investigated by transient and isotopic experiments. Transient isothermal reduction by hydrogen evidenced lower activation energy and higher reduction rates of lattice oxygen in the case of CeO2-NR compared to those of CeO2-NP. Transient 16O/18O isotopic exchange provided a lower Eapp of bulk oxygen diffusion (by ∼90 kJ mol−1) for CeO2-NR compared to CeO2-NP. 18O/16O isotopic exchange followed by DRM revealed higher carbon oxidation rates by lattice oxygen to C18O(g) in the case of CeO2-NR compared to those of CeO2-NP, in harmony with the lower amount of carbon accumulated in the former catalyst. The lower Eapp of DRM and carbon oxidation by lattice oxygen confirm the higher DRM activity on Ni/CeO2-NR compared to Ni/CeO2-NP. HAADF-STEM and Raman studies were linked to the observed transient kinetic results.
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