Morphology-Dependent Catalytic Activity of Ru/CeO(2) in Dry Reforming of Methane

Three morphology-controlled CeO(2), namely nanorods (NRs), nanocubes (NCs), and nanopolyhedra (NPs), with different mainly exposed crystal facets of (110), (100), and (111), respectively, have been used as supports to prepare Ru (3 wt.%) nanoparticle-loaded catalysts. The catalysts were characterized by H(2)-temperature programmed reduction (H(2)-TPR), CO– temperature programmed desorption (CO-TPD), N(2) adsorption–desorption, X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM) and energy-dispersive X-ray spectroscopy (XDS). The characterization results showed that CeO(2)-NRs, CeO(2)-NCs, and CeO(2)-NPs mainly expose (110), (100) and (111) facets, respectively. Moreover, CeO(2)-NRs and CeO(2)-NCs present higher oxygen vacancy concentration than CeO(2)-NPs. In the CO(2) reforming of methane reaction, Ru/CeO(2)-NR and Ru/CeO(2)-NC catalysts showed better catalytic performance than Ru/CeO(2)-NPs, indicating that the catalysts with high oxygen vacancy concentration are beneficial for promoting catalytic activity.