In Situ Raman Spectroscopy Study on Dissociation of Methane at High Temperatures and at High Pressures  

作　　者：陈晋阳 金鹿江 董俊萍 郑海飞 

机构地区：[1]School of Environmental and Chemical Engineering, Shanghai University, Shanghai 201800 [2]School of Sciences, Shanghai University, Shanghai 200436 [3]School of the Earth and Space Sciences, Peking University, Beijing 100871

出　　处：《Chinese Physics Letters》2008年第2期780-782,共3页中国物理快报（英文版）

基　　金：Supported by National Natural Science Foundation of China under Grant No. 20777048, and the Shanghai Leading Academic Disciplines （T105）.

摘　　要：We investigate the stability and dissociation of methane, which is the most abundant organic molecule in the universe, using diamond anvil cell （DAC） with in situ Raman spectroscopy up to 903K and 21 GPa. At the temperatures of 793 and 723 K and the corresponding pressures of 16.15 and 20.30 GPa, methane dissociates to form carbon ＇soot＇ and heavier hydrocarbons involving C=C and C≡C bonds. However, if the pressure is not very high, methane remains stability up to the highest temperature of 903 K of the work. The four symmetric C-H bonds of methane split at high temperatures and at high pressures, and there is at least one phase transition of crystalline symmetry from face centred cubic （fcc） to hexagonal close packed （hcp） before dissociation.We investigate the stability and dissociation of methane, which is the most abundant organic molecule in the universe, using diamond anvil cell （DAC） with in situ Raman spectroscopy up to 903K and 21 GPa. At the temperatures of 793 and 723 K and the corresponding pressures of 16.15 and 20.30 GPa, methane dissociates to form carbon ＇soot＇ and heavier hydrocarbons involving C=C and C≡C bonds. However, if the pressure is not very high, methane remains stability up to the highest temperature of 903 K of the work. The four symmetric C-H bonds of methane split at high temperatures and at high pressures, and there is at least one phase transition of crystalline symmetry from face centred cubic （fcc） to hexagonal close packed （hcp） before dissociation.

关 键 词：SOLID METHANE HYDROCARBONS PHASE 

分 类 号：O623.11[理学—有机化学]