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<p>To intuitively evaluate the aromatic structure arrangement and structural evolution of the cutinite during thermal alteration, the quantification parameters of aromatic fringes were observed using programmed temperature high-resolution transmission electron microscopy (HRTEM) in situ heating technology, and the pyrolysates was analyzed using pyrolyzer coupled with gas chromatography/mass spectrometry (Py-GC/MS). In aromatic structure size distribution, a large proportion of shorter stripes (&lt; 0.59&#xa0;nm) and a small proportion of longer fringes (&gt; 0.99&#xa0;nm) were observed in the heated sample, and the long fringes gradually increased and dominated. In orientation distribution, more larger polycyclic aromatic clusters were observed in HRTEM with pyrolysis temperature, and the aromatic fringes became more regular. The main orientation of aromatic structures presented three stages, including cracking stage, condensation stage, and rearrangement stage. In the stacking configuration distribution, there were various cross-linking modes between aromatic stripes in the cutinite during the low-temperature stage, mainly Y-shaped and edge-to-edge (T-shaped). The cross-linking between aromatic stripes in the high-temperature stag gradually presented a stacked structure of parallel dislocations (sandwich and parallel displacement). In the coupling relationship between the evolution of aromatic layers and free aromatics, the changes in the aromatic structure of the cutinite were different. Benzene and naphthalene exhibited a similar evolutionary pattern (increasing first, then decreasing, and then increasing again), while anthracene and the 2 × 2 aromatic layer showed the opposite trend. The low-temperature stage of cutinite pyrolysis was mainly characterized by cracking reactions, while the high-temperature stage was mainly characterized by condensation reactions.</p>

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Evolution features of aromatic structure in cutinite from cutinitic liptobiolith during in situ HRTEM heating alteration

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Du Meili,
  • Liu Lei,
  • Fan Jinwen,
  • Li Jiantao,
  • Li Gang,
  • Cai Yuchu,
  • Bai Wu

摘要

To intuitively evaluate the aromatic structure arrangement and structural evolution of the cutinite during thermal alteration, the quantification parameters of aromatic fringes were observed using programmed temperature high-resolution transmission electron microscopy (HRTEM) in situ heating technology, and the pyrolysates was analyzed using pyrolyzer coupled with gas chromatography/mass spectrometry (Py-GC/MS). In aromatic structure size distribution, a large proportion of shorter stripes (< 0.59 nm) and a small proportion of longer fringes (> 0.99 nm) were observed in the heated sample, and the long fringes gradually increased and dominated. In orientation distribution, more larger polycyclic aromatic clusters were observed in HRTEM with pyrolysis temperature, and the aromatic fringes became more regular. The main orientation of aromatic structures presented three stages, including cracking stage, condensation stage, and rearrangement stage. In the stacking configuration distribution, there were various cross-linking modes between aromatic stripes in the cutinite during the low-temperature stage, mainly Y-shaped and edge-to-edge (T-shaped). The cross-linking between aromatic stripes in the high-temperature stag gradually presented a stacked structure of parallel dislocations (sandwich and parallel displacement). In the coupling relationship between the evolution of aromatic layers and free aromatics, the changes in the aromatic structure of the cutinite were different. Benzene and naphthalene exhibited a similar evolutionary pattern (increasing first, then decreasing, and then increasing again), while anthracene and the 2 × 2 aromatic layer showed the opposite trend. The low-temperature stage of cutinite pyrolysis was mainly characterized by cracking reactions, while the high-temperature stage was mainly characterized by condensation reactions.