A Combined Raman Spectroscopic and Thermogravimetric Analysis Study on Oxidation of Coal with Different Ranks

Figure 4

Different Raman band area ratios, , , and , correlated with coal reactivity indexes: (a) (1°C min⁻¹), (b) (1°C min⁻¹), (c) (10°C min⁻¹), (d) (1°C min⁻¹), and (e) (10°C min⁻¹), respectively. The error bars show the standard deviations of the parameters for each coal sample.

(a)

(b)

(c)

(d)

(e)