Structural transformation of fluid phase extracted from coal matrix during thermoplastic stage of coal pyrolysis

Effects of poplar addition on tar formation during the co-pyrolysis of fat coal and poplar at high temperature

“…3. 8,[28][29][30] For fat coal tar, many PAHs with rings $ 2 can be detected, and the main reaction pathway to the formation of these PAHs is shown as route 2 in Fig. 3.…”

“…3. 8,28,29 Phenolic compounds are properly caused by the decomposition of polycyclic aromatic compounds, as shown by route 1 in Fig. 3.…”

“…23,[25][26][27] Furthermore, the detailed structure information can be obtained by the curve-tting of two FT-IR regions (3000 to 2800 cm À1 and 1800 to 1490 cm À1 ). The structure parameters Afactor and CH 2 /CH 3 can be calculated by the following equations: [25][26][27][28] A-factor ¼ (A 3000-2800 cm À1 )/(A 3000-2800 cm À1 + A 1650-1490 cm À1 ) (1)…”

“…Two large sections of protons, namely aromatic and aliphatic protons, can be seen in the ranges of 9.5 to 6.3 ppm and 4.5 to 0.5 ppm, respectively. In this work, the aromatic and aliphatic protons are divided into several parts to provide detailed structure information, 28,39 as shown in Table S2. † However, a few protons exist in the 6.3 to 4.5 ppm range, indicating traces of alkenes and their derivatives in the tar samples; this result can be conrmed by the GC-MS analysis.…”

“…9 shows the effects of poplar addition on the tar formation during the co-pyrolysis of fat coal and poplar. 8,17,[28][29][30][40][41][42][43][44][45][46] The coal macromolecular structure is based on the 3D Wiser model constructed by Materials Studio. 28 Meanwhile, the poplar structure originates from the analysis in previous studies.…”