Surface WO4 tetrahedron: the essence of the oxidative coupling of methane over M–W–Mn/SiO2 catalysts
文献类型：期刊论文
| 作者 | Xu CZ(许传芝) ; Chou LJ(丑凌军)
|
| 刊名 | Journal of Catalysis
 |
| 出版日期 | 2003 |
| 卷号 | 220页码:47-56 |
| 关键词 | Oxidative coupling of methane M–W–Mn/SiO2 catalyst WO4 tetrahedron WO6 octahedron Structure |
| ISSN号 | 0021-9517 |
| 通讯作者 | Malcolom L.H. Green |
| 中文摘要 | A series of M–W–Mn/SiO2 catalysts (M = Li, Na, K, Ba, Ca, Fe, Co, Ni, and Al) have been prepared and their catalytic performance for the oxidative coupling of methane (OCM) was evaluated in a continuous-flow microreactor. The structural properties of the catalysts have been studied using X-ray photoelectron spectroscopy (XPS), laser Raman spectroscopy (LRS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). In the trimetallic catalysts studied, there was evidence for WO4 tetrahedron on the surface in the Li–, Na–, and K–W–Mn/SiO2 catalysts, which is mainly present in the subsurface of the Ba–W–Mn/SiO2 catalyst. It appears that the WO4 has a strong interaction with the α-cristobalite support and is stabilized in the Na– and K–W–Mn/SiO2 catalysts. However, the WO4 species appear to be less stable in Li– or Ba–W–Mn/SiO2 catalysts, in which the support turns into quartz SiO2 or amorphous SiO2. The WO4 tetrahedron on the catalyst surface appears to play an essential role in achieving high CH4 conversion and high C2 hydrocarbon selectivity in the OCM reaction. Calculations suggest that the WO4 tetrahedron interacts with the CH4, giving suitable geometry and energy matching with CH4, and this may account for the high OCM activities. |
| 收录类别 | SCI |
| 资助信息 | the 973 Project of the Ministry of Science and Technology, PR China (Grant G1999022406);the Royal Society for a UK–China Joint Project |
| 语种 | 英语 |
| 公开日期 | 2014-01-23 |
| 源URL | [http://210.77.64.217/handle/362003/5046]  |
| 专题 | 兰州化学物理研究所_OSSO国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Xu CZ,Chou LJ. Surface WO4 tetrahedron: the essence of the oxidative coupling of methane over M–W–Mn/SiO2 catalysts[J]. Journal of Catalysis,2003,220:47-56. |
| APA | 许传芝,&丑凌军.(2003).Surface WO4 tetrahedron: the essence of the oxidative coupling of methane over M–W–Mn/SiO2 catalysts.Journal of Catalysis,220,47-56. |
| MLA | 许传芝,et al."Surface WO4 tetrahedron: the essence of the oxidative coupling of methane over M–W–Mn/SiO2 catalysts".Journal of Catalysis 220(2003):47-56. |
入库方式： OAI收割
来源：兰州化学物理研究所
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