Mechanochemical Redox: Calcination‐free Synthesis of Ceria‐hybrid Catalyst with Ultra‐High Surface Area

Abstract

Transition metal-doped CeO 2 (MCeO x ) is of great importance in industrial catalysis. However, current synthetic methods often result in the separation of MO x phases, which significantly decreases their catalytic activity. Toward this end, the chemistry of mechanochemical redox was introduced to prepare Ce 1-x Mn x O 2-δ catalyst. The redox behavior between MnO 4 À and Ce 3 + could in situ produces atomically dispersed Ce 1-x Mn x O 2-δ solid solution without calcination. Moreover, the mechanochemical synthesis endows Ce 1-x Mn x O 2-δ a surface area (302 m 2 /g) that is much higher than the counterparts prepared by traditional methods, such as co-precipitation method (66 m 2 /g) CTABassisted precipitation method (122 m 2 /g) and sol-gel method (136 m 2 /g). Importantly, the well dispersed heteroatoms and high porosity afford doped ceria excellent activity and stability during CO oxidation. The reaction mechanism was finally explored by DFT calculation, which reveals that Mn and Cu dopants facilitate electron transfer and oxygen releasing.

Self-Assembly Dual Active Site Nanocomposite Anode Ce0.6Mn0.3Fe0.1O2−δ/NiFe/MnOx for Electrooxidative Dehydrogenation of Ethane to Ethylene

“…In addition, the CeO 2 -based metal oxide has attracted a lot of attention recently due to its good catalytic performance on hydrocarbon fuels with strong antioxidation and anticarbon accumulation ability. Doping different valence elements, e.g., transition metals with larger ionic radii, into CeO 2 -based materials to enhance active sites and the concentration of oxygen vacancies has been proved to be an effective strategy to improve its alkane dehydrogenation activity; for instance, doping Mn, Fe, Cu, and Co into the Ce site can accelerate oxygen ion diffusion and electrochemical alkane dehydrogenation activity. − …”