| Summary: | Suppressing the usage of rare-earth elements is crucial for making the catalysts sustainable. Preparing CeO<sub>2</sub> nanoparticles is a common technique to reduce CeO<sub>2</sub> consumption, but such nanoparticles are prone to sinter or react with the supports when subjected to heat treatments. This study demonstrated that stable CeO<sub>2</sub> nanoparticles were deposited on MgO by the simple impregnation method. When CeO<sub>2</sub>/MgO was prepared under the dry atmosphere, the CeO<sub>2</sub> nanoparticles remained ~3 nm in diameter even after being heated at 800 °C, which is much smaller than ~5 nm of CeO<sub>2</sub>/MgO prepared under ambient air. Temperature-programmed reduction, temperature-programmed oxidation, X-ray photoelectron spectroscopy, and in situ X-ray diffraction studies showed that CeO<sub>2</sub>/MgO exhibited higher oxygen mobility when prepared under the dry atmosphere. Dry reforming reaction demonstrated that CeO<sub>2</sub>/MgO prepared under the dry atmosphere exhibited higher activity than that prepared under ambient air and pure CeO<sub>2</sub>.
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