Surface WO4 tetrahedron: the essence of the oxidative coupling of methane over M–W–Mn/SiO2 catalysts

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	Surface WO4 tetrahedron: the essence of the oxidative coupling of methane over M–W–Mn/SiO2 catalysts
	Xu CZ(许传芝); Chou LJ(丑凌军)
刊名	Journal of Catalysis
	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
内容类型	期刊论文
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.