Oligomerization and carbonization of polycyclic aromatic hydrocarbons at high pressure and temperature

Artem D. Chanyshev, Konstantin D. Litasov, Anton Shatskiy, Yoshihiro Furukawa, Takashi Yoshino, Eiji Ohtani

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

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 largevolume 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 300 K. 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 300 K. 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.

Original languageEnglish
Pages (from-to)225-235
Number of pages11
JournalCarbon
Volume84
Issue number1
DOIs
Publication statusPublished - 2015 Jan 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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