Citation: M. Y. Lee, J. S. Nam, J. H. Seo. Synthesis of Ni-CeO₂ catalyst for the partial oxidation of methane using RF thermal plasma[J]. Chinese Journal of Catalysis, ;2016, 37(5): 743-749. doi: 10.1016/S1872-2067(15)61071-3 shu

Synthesis of Ni-CeO₂ catalyst for the partial oxidation of methane using RF thermal plasma

M. Y. Lee ^a ,
J. S. Nam ^b ,
J. H. Seo ^a,b,,

1.
a Department of Applied Plasma Engineering, Chonbuk National University, Jeonbuk 54896, Korea;
2.
b Department of Quantum System Engineering, Chonbuk National University, Jeonbuk 54896, Korea

Corresponding author: J. H. Seo,
Received Date: 4 January 2016
Available Online: 23 February 2016

Ni-CeO₂ catalysts with a nickel content of 50 mol% were prepared using RF thermal plasma, and their catalytic activities for methane partial oxidation were characterized. For the synthesis of Ni-CeO₂ catalysts, a precursor containing Ni (~5-μm diameter) and CeO₂ (~200-nm diameter) powders were heated simultaneously using an RF plasma at a power level of ~52 kVA and a powder feeding rate of ~120 g/h. From the X-ray diffraction data and transmission electron microscopy images, the precursor formed into high crystalline CeO₂ supports with nanosized Ni particles (< 50-nm diameter) on their surfaces. The catalytic performance was evaluated under atmospheric pressure at > 500 ℃ and a CH₄:O₂ molar ratio of 2:1 with Ar diluent. Although the Ni content was high (~50 mol%), the experimental results reveal a methane conversion rate of > 70%, selectivities of CO and H₂ greater than 90% and slight carbon coking during an on-stream test at 550 ℃ for 24 h. However, at 750 ℃, the on-stream test revealed the formation of filament-like carbons with an increased methane conversion rate over 90%.
- RF thermal plasma,
- Methane,
- Partial oxidation,
- Nickel catalyst,
- Ceria,
- Carbon deposition
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Synthesis of Ni-CeO2 catalyst for the partial oxidation of methane using RF thermal plasma

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通讯作者: 陈斌, bchen63@163.com

Synthesis of Ni-CeO₂ catalyst for the partial oxidation of methane using RF thermal plasma