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Abstract
Three morphology-controlled CeO2, 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 H2-temperature programmed reduction (H2-TPR), CO– temperature programmed desorption (CO-TPD), N2 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 CeO2-NRs, CeO2-NCs, and CeO2-NPs mainly expose (110), (100) and (111) facets, respectively. Moreover, CeO2-NRs and CeO2-NCs present higher oxygen vacancy concentration than CeO2-NPs. In the CO2 reforming of methane reaction, Ru/CeO2-NR and Ru/CeO2-NC catalysts showed better catalytic performance than Ru/CeO2-NPs, indicating that the catalysts with high oxygen vacancy concentration are beneficial for promoting catalytic activity.
Highlights
As one of the most important emissions of modern industry and life, CO2 has attracted great attention for its influence on global warming [1,2,3]
It is reasonable to believe that the use of CeO2 supports specific exposed crystal facets may influence the catalytic behavior of the catalyst in dry reforming of methane
CeO2 -NRs with the rod-like morphology in Figure 1a,d exhibit a uniform diameter of ca. 10 nm with two obvious interplanar spacings of 0.19 and 0.27 nm, corresponding to the (220) and (200) lattice fringes, respectively
Summary
As one of the most important emissions of modern industry and life, CO2 has attracted great attention for its influence on global warming [1,2,3]. For the methane dry reforming reaction, many kinds of catalysts have been widely studied by loading active metals on different supports. A lot of work has focused on the influence of the different metal oxide supports, such as SiO2 , γ-Al2 O3 , MgO, ZrO2 , La2 O3 , and TiO2 [18,19,20,21,22,23,24] These studies showed that the supports played an important role in their catalytic activity. It is reasonable to believe that the use of CeO2 supports specific exposed crystal facets may influence the catalytic behavior of the catalyst in dry reforming of methane. The influence of the exposed crystal facets of the CeO2 supports on the catalytic activities was investigated in detail
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