FT-IR Investigation of the Structural Changes of Sulcis and South Africa Coals under Progressive Heating in Vacuum: Correlation with Volatile Matter

Table 4

Qualitative distribution of vapors collected in the cooling trap (c) with liquid nitrogen.

Coal

T (°C)

CO2

COS

SO2

Me2CO

CS2

HCN

Me2C=CH2

C2H4

MeCH=CH2

C2H6

Et2O

C3H8 + C4H10

Sulcis

200

s

m

s

m

300

s

s

s

m

w

w

w

400

s

s

m

m

m

m

s

w

w

s

m

500

s

s

w

w

m

w

s

m

s

m

600

s

s

w

w

m

w

s

m

m

m

700

s

s

m

m

w

800

s

s

w

m

South Africa

100

m

w

200

w

300

w

400

s

w

w

w

w

w

w

m

500

s

m

m

s

m

s

s

s

s

s

600

s

m

m

w

w

s

s

s

s

700

s

m

w

m

s

w

s

m

800

s

w

m

m

w

Intensity of analytical bands: w: weak; m: medium, s: strong: Me: methyl group; Et: ethyl group.