In situ High-pressure NMR Observations on the Formation and Dissociation of Methane Hydrate  

作　　者：Ai Bing CHEN Wei Ping ZHANG Xi Jie LAN Heng ZHENG Xiu Mei LIU Xiu Wen HAN Xin He BAO 

机构地区：[1]State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023

出　　处：《Chinese Chemical Letters》2006年第6期791-794,共4页中国化学快报（英文版）

基　　金：We gratefully acknowledge the National Natural Science Foundation of China for the financial support （No.90210024）.

摘　　要：A home-made static NMR cell with pressure up to 10 MPa was employed to observe the formation and dissociation processes of methane hydrate by in situ ^1H and ^13C NMR spectroscopies. Methane hydrate can be formed or decomposed in the temperature range of -5 to -13℃ at pressures between 4.0 and 7.0 MPa. The higher methane pressure, the formation or dissociation temperature of methane hydrate was higher. In situ ^1H NMR experiments indicated that the critical size of the hydrate clusters is crucial for the formation of methane hydrate.A home-made static NMR cell with pressure up to 10 MPa was employed to observe the formation and dissociation processes of methane hydrate by in situ ^1H and ^13C NMR spectroscopies. Methane hydrate can be formed or decomposed in the temperature range of -5 to -13℃ at pressures between 4.0 and 7.0 MPa. The higher methane pressure, the formation or dissociation temperature of methane hydrate was higher. In situ ^1H NMR experiments indicated that the critical size of the hydrate clusters is crucial for the formation of methane hydrate.

关 键 词：In situ NMR high-pressure NMR METHANE methane hydrate hydrate formation hydrate dissociation. 

分 类 号：O623.11[理学—有机化学]