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Electro-oxidation of Concentrated ce(Ⅲ) at Carbon Felt Anode in Nitric Acid Media

Journal of Rare Earths 2006年第3期24卷 257-263页

作者： Jelinek Ludek Mikio Kumagai Nuclear Chemistry and Chemical Engineering center Institute of Research and Innovation 1201 Takada Kashiwa 277-0861 Chiba-ken Japan

Electro-oxidation of ce （ Ⅲ ） to ce （ Ⅳ ） in parallel plate flow type electrolyzer divided with cation exchange membrane was carried out in nitric acid media at carbon felt anode under galvanostatic conditions. Carbon felt was used as an anode for its high specific surface area and high oxygen evolution overpotential. Pt coated Ti plates were used as cathode and anode current feeder. The oxidation of 1 mol· L^-1 ce（ Ⅲ ） solution in 2 mol· L^- 1 HNO3 was proceeding with a high current efficiency （92%） until about 80% of ce（ Ⅲ ） was oxidized. Then, oxygen evolution, accompanied by terminal voltage jump, took place, lowering current efficiency. ce（ Ⅲ ） was oxidized up to 90% with current efficiency of 62%. In this mode, strong carbon felt anode oxidation was observed. The wear out of carbon felt was 46% in six consequent runs （6 h of operation）. After each run, carbon felt surface had to be renewed with slightly alkaline solution to remove carbon oxidation products and ensure regular operational conditions. When anode surface was blocked, oxygen evolution took place from the beginning of electrolysis due to higher actual current density. The wear out of carbon felt anode could be minimized by means of oxygen evolution prevention. In the case when electrolysis had been stopped before oxygen evolution started （at ce（ Ⅳ ） conversion of about 80% ）, the wear out of anode was less than 2% during 6 consequent runs （4 h of operation）.

关键词： electrolyzer ce oxidation carbon felt anode rare earths

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Density Function Theory Study on the Reaction Mechanism of cerium with Oxygen for ce-bearing Aerosol Particle Formation

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Journal of Wuhan University of Technology(Materials Science) 2020年第3期35卷 501-505页

作者： XIE Bo WANG Qingqing LONG Xinggui HU Sheng GAO Tao Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621999China Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China

We obtained the reaction mechanism of cerium with oxygen by means of density functional theory (DFT) under the explosive or detonation situation. The energy level order of cerium was calculated and the potential energy profile was plotted. The properties of the bonds of all special structures in the reaction path were analyzed using the method of the electron localization function (ELF). The results indicate that the final reaction pathway can be expressed as ce+O2→ FC→TS→IM→O-ce-O, and the formation of ce2O3 has not been found. In addition, the ELF diagram of the final product ceO2 shows that ce bonds with both O atoms and the bond angles increase significantly.

关键词： ce oxidation reaction mechanism electronic localized function aerosol particles

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