Raman spectra of structure I methane hydrate under different pressures

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...

Full description

Bibliographic Details
Main Authors: Wu XiangYang, Duan Tiyu, Yang Wei, Sun Qiang
Other Authors: Wu, XY (reprint author), Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China., Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China., Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Peoples R China., Peking Univ, Sch Earth & Space Sci, Inst Geochem, Beijing 100859, Peoples R China., Natl Jewelry Qual Supervis & Inspect Ctr, Beijing 100101, Peoples R China.
Format: Journal/Newspaper
Language:English
Published: 岩石学报 2008
Subjects:
structure I methane hydrate
Raman spectrum
high pressure
CLATHRATE HYDRATE
PHASE-EQUILIBRIUM
SPECTROSCOPY
SYSTEM
WATER
ICE
Anvil
Doublets
The Doublets
Methane hydrate
Online Access:https://hdl.handle.net/20.500.11897/397604
Description
Summary: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. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000254774000015&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 Geology SCI(E) 中文核心期刊要目总览(PKU) 中国科技核心期刊(ISTIC) 中国科学引文数据库(CSCD) 1 1 171-175 24

Similar Items