Citation: JIAO Zhi-Feng, DONG Li-Li, GUO Xiao-Ning, JIN Guo-Qiang, GUO Xiang-Yun, WANG Xiao-Min. Methane Catalytic Combustion over Ni/SiC, Fe/SiC and Co/SiC Modified by Zr_0.5Ce_0.5O₂ Solid Solution[J]. Acta Physico-Chimica Sinica, ;2014, 30(10): 1941-1946. doi: 10.3866/PKU.WHXB201408181 shu

Methane Catalytic Combustion over Ni/SiC, Fe/SiC and Co/SiC Modified by Zr_0.5Ce_0.5O₂ Solid Solution

1.
1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China;
2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China

Received Date: 14 May 2014
Available Online: 18 August 2014
Fund Project:

We used Zr_0.5Ce_0.5O₂ solid solution modified high specific surface area SiC as the catalyst support and synthesized Ni/Ce_0.5Zr_0.5O₂/SiC, Fe/Ce_0.5Zr_0.5O₂/SiC, and Co/Ce_0.5Zr_0.5O₂/SiC catalysts by a two-step impregnation method. The catalytic activity and stability were investigated in the catalytic combustion deoxidation of coal-bed gas. The as-prepared catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma- mass spectroscopy (ICP- MS), high- resolution transmission electron microscope (HRTEM), Brunner-Emmet-Teller (BET) measurements, thermal gravimetric analysis (TGA), and temperature-programmed reduction of H₂ (H₂-TPR). The results suggest that partial diffusion of Ni, Fe, and Co to the Ce_0.5Zr_0.5O₂ lattice leads to the formation of defects in the catalyst bulk phase. Ce_0.5Zr_0.5O₂ increased the redox process between metals and their oxides, improving the oxygen storage, mobility capacity, and the activation of CH₄. In addition, the excellent resistance of both SiC and Ce_0.5Zr_0.5O₂ solid solution to carbon deposition effectively inhibited coke formation on the catalysts during the combustion of rich methane atmosphere. Hence, these catalysts have od catalytic combustion deoxidation activity and stability. Co/ Ce_0.5Zr_0.5O₂/SiC catalyst had the best activity among the three catalysts: CH₄ was activated at 320 ℃ and O2 was completely removed at 410 ℃.
- High surface area SiC,
- Transition metal catalyst,
- Zr_0.5Ce_0.5O₂ solid solution,
- Methane catalytic combustion,
- Deoxidation of coal-bed gas
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Methane Catalytic Combustion over Ni/SiC, Fe/SiC and Co/SiC Modified by Zr0.5Ce0.5O2 Solid Solution

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通讯作者: 陈斌, bchen63@163.com

Methane Catalytic Combustion over Ni/SiC, Fe/SiC and Co/SiC Modified by Zr_0.5Ce_0.5O₂ Solid Solution