Raman spectra of structure I methane hydrate under different pressures

	Raman spectra of structure I methane hydrate under different pressures
	Wu XiangYang 1,2; Duan Tiyu 3,4; Yang Wei 1; Sun Qiang 3
刊名	ACTA PETROLOGICA SINICA
	2008
卷号	24 期号:1 页码:171-175
关键词	structure I methane hydrate Raman spectrum high pressure
ISSN号	1000-0569
文献子类	Article
英文摘要	We report on a set of Raman spectra of structure I methane hydrates under pressures of 132 similar to 901MPa and 25 degrees C. Methane hydrate samples were synthesized with small granular ices as 'seed' and pure methane, under a pressure of 18 MPa and changing temperature from 0 degrees C to 9 degrees C for about 2 days. The samples were observed with microscopy and in situ measured with Raman Spectroscopy in a diamond anvil cell. The result showed that the Raman spectra of samples were doublets with left peak positions of 2904.4 similar to 2907.2 cm(-1) and right peak positions of 2915 similar to 2922 cm(-1). shifted to higher wavenumbers with increasing pressures. The typical intensity ratio of the doublets was about 3 : 1, which is as characteristics of structure I. That means that methane hydrate can maintain structure I up to a high pressure. Also Ramam spectra for methane dissolved in water and methane in gas phase were measured under a pressure of about 170MPa and 25 degrees C, which were obviously different to the Raman spectra of structure I methane hydrate samples.
WOS关键词	CLATHRATE HYDRATE ; PHASE-EQUILIBRIUM ; SPECTROSCOPY ; SYSTEM ; WATER ; ICE
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000254774000015
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/69694]
专题	中国科学院地质与地球物理研究所
通讯作者	Wu XiangYang
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Peoples R China 3.Peking Univ, Sch Earth & Space Sci, Inst Geochem, Beijing 100859, Peoples R China 4.Natl Jewelry Qual Supervis & Inspect Ctr, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Wu XiangYang,Duan Tiyu,Yang Wei,et al. Raman spectra of structure I methane hydrate under different pressures[J]. ACTA PETROLOGICA SINICA,2008,24(1):171-175.
APA	Wu XiangYang,Duan Tiyu,Yang Wei,&Sun Qiang.(2008).Raman spectra of structure I methane hydrate under different pressures.ACTA PETROLOGICA SINICA,24(1),171-175.
MLA	Wu XiangYang,et al."Raman spectra of structure I methane hydrate under different pressures".ACTA PETROLOGICA SINICA 24.1(2008):171-175.