کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7851934 | 1508863 | 2015 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Oligomerization and carbonization of polycyclic aromatic hydrocarbons at high pressure and temperature
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
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چکیده انگلیسی
We have examined the stabilities of different polycyclic aromatic hydrocarbons (PAHs) at 7Â GPa and 773-973Â K and at 16Â GPa and 300Â 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 7Â GPa and 773-873Â K and insignificant PAH oligomerization at 16Â GPa and 300Â K. At 7Â GPa and 773Â K, oligomers with molecular weight up to 3400Â Da were found, while only a small number of dimers of the starting PAHs were detected at 16Â GPa and 300Â K. PAH decomposition at 7Â GPa occurred from 873 to 973Â K, and the decomposition products consisted of nanocrystalline graphite. The determined decomposition temperatures of the PAHs (873-973Â K) are much lower than Earth's geotherms and the subduction slab P-T profiles at 7Â GPa; therefore, PAH inclusions in mantle-derived minerals, which can be crystallized at 6-7Â GPa and 1600-1700Â 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 84, April 2015, Pages 225-235
Journal: Carbon - Volume 84, April 2015, Pages 225-235
نویسندگان
Artem D. Chanyshev, Konstantin D. Litasov, Anton F. Shatskiy, Yoshihiro Furukawa, Takashi Yoshino, Eiji Ohtani,