| Инд. авторы: | Chanyshev A.D., Litasov K.D., Shatskiy A.F., Furukawa Y., Yoshino T., Ohtani E. |
| Заглавие: | Oligomerization and carbonization of polycyclic aromatic hydrocarbons at high pressure and temperature |
| Библ. ссылка: | Chanyshev A.D., Litasov K.D., Shatskiy A.F., Furukawa Y., Yoshino T., Ohtani E. Oligomerization and carbonization of polycyclic aromatic hydrocarbons at high pressure and temperature // Carbon. - 2015. - Vol.84. - P.225-235. - ISSN 0008-6223. - EISSN 1873-3891. |
| Внешние системы: | DOI: 10.1016/j.carbon.2014.12.011; SCOPUS: 2-s2.0-84922219376; WoS: 000348955500025; |
| Реферат: | eng: We have examined the stabilities of different polycyclic aromatic hydrocarbons (PAHs) at 7 GPa and 773-973 K and at 16 GPa and 300 K. Experiments were performed using a large-volume multi-anvil apparatus. Quenched products were analyzed by matrix-assisted laser desorption/ionization (MALDI) and Raman spectroscopy. The MALDI measurements revealed the considerable oligomerization of PAHs at 7 GPa and 773-873 K and insignificant PAH oligomerization at 16 GPa and 300K. At 7 GPa and 773 K, oligomers with molecular weight up to 3400 Da were found, while only a small number of dimers of the starting PAHs were detected at 16 GPa and 300K. PAH decomposition at 7 GPa occurred from 873 to 973 K, and the decomposition products consisted of nanocrystalline graphite. The determined decomposition temperatures of the PAHs (873-973 K) are much lower than Earth's geotherms and the subduction slab P-T profiles at 7 GPa; therefore, PAH inclusions in mantle-derived minerals, which can be crystallized at 6-7 GPa and 1600-1700 K, should be secondary phases and could be formed by the successive polycondensation of simple hydrocarbon molecules under natural catalysts during eruption processes at sub-ambient pressures and temperatures. (C) 2014 Elsevier Ltd. All rights reserved.
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| Ключевые слова: | DEEP MANTLE; RAMAN-SPECTRA; PHASE-RELATIONS; AMORPHOUS-CARBON; MOLECULAR-DYNAMICS; INTERSTELLAR-MEDIUM; MURCHISON METEORITE; CARBONATED ECLOGITE; EARTHS MANTLE; O-H FLUID; |
| Издано: | 2015 |
| Физ. характеристика: | с.225-235 |