In Situ Raman Spectroscopy Study on Dissociation of Methane at High Temperatures and at High Pressures
CHEN Jin-Yang1, JIN Lu-Jiang1, DONG Jun-Ping2, ZHENG Hai-Fei3
1School of Environmental and Chemical Engineering, Shanghai University, Shanghai 2018002School of Sciences, Shanghai University, Shanghai 2004363School of the Earth and Space Sciences, Peking University, Beijing 100871
In Situ Raman Spectroscopy Study on Dissociation of Methane at High Temperatures and at High Pressures
1School of Environmental and Chemical Engineering, Shanghai University, Shanghai 2018002School of Sciences, Shanghai University, Shanghai 2004363School of the Earth and Space Sciences, Peking University, Beijing 100871
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 21GPa. At the temperatures of 793 and 723K and the corresponding pressures of 16.15 and 20.30GPa, 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 903K 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.
Abstract： 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 21GPa. At the temperatures of 793 and 723K and the corresponding pressures of 16.15 and 20.30GPa, 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 903K 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.
(Raman and Rayleigh spectra (including optical scattering) ?)
引用本文:
CHEN Jin-Yang;JIN Lu-Jiang;DONG Jun-Ping;ZHENG Hai-Fei. In Situ Raman Spectroscopy Study on Dissociation of Methane at High Temperatures and at High Pressures[J]. 中国物理快报, 2008, 25(2): 780-782.
CHEN Jin-Yang, JIN Lu-Jiang, DONG Jun-Ping, ZHENG Hai-Fei. In Situ Raman Spectroscopy Study on Dissociation of Methane at High Temperatures and at High Pressures. Chin. Phys. Lett., 2008, 25(2): 780-782.
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