High Dispersion of CeO2 on CeO2/MgO Prepared under Dry Conditions and Its Improved Redox Properties

Energies

Kenji Taira¹  Reiko Murao¹ 

[1] Advanced Technology Research Laboratories, Nippon Steel Corporation, 20-1 Shintomi, Futtsu 293-8511, Chiba, Japan;

关键词: CeO₂;    MgO;    dry reforming;    heterogeneous catalysis;    in situ XRD;   

DOI  :  10.3390/en14237922

来源: DOAJ

【 摘 要 】

Suppressing the usage of rare-earth elements is crucial for making the catalysts sustainable. Preparing CeO₂ nanoparticles is a common technique to reduce CeO₂ consumption, but such nanoparticles are prone to sinter or react with the supports when subjected to heat treatments. This study demonstrated that stable CeO₂ nanoparticles were deposited on MgO by the simple impregnation method. When CeO₂/MgO was prepared under the dry atmosphere, the CeO₂ nanoparticles remained ~3 nm in diameter even after being heated at 800 °C, which is much smaller than ~5 nm of CeO₂/MgO prepared under ambient air. Temperature-programmed reduction, temperature-programmed oxidation, X-ray photoelectron spectroscopy, and in situ X-ray diffraction studies showed that CeO₂/MgO exhibited higher oxygen mobility when prepared under the dry atmosphere. Dry reforming reaction demonstrated that CeO₂/MgO prepared under the dry atmosphere exhibited higher activity than that prepared under ambient air and pure CeO₂.

【 授权许可】

Unknown