Evolution Mechanism of Macromolecular Structure in Coal during Heat Treatment: Based on FTIR and XRD In Situ Analysis Techniques

Figure 5

In situ infrared spectra of five coal samples at the same temperature: (a) 100°C; (b) 200°C; (c) 300°C; (d) 400°C; (e) 500°C.

(a)

(b)

(c)

(d)

(e)