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

Table 2

Qualitative distribution of vapors collected in the cooling trap (b) with solid CO₂ + acetone.

Coal	T (°C)	C6H6	Me-C6H5	n-Hydr.^a	Me2CO	HCN	Et-CO-Me	NH3	Olefins
Sulcis	25
	100
	200
	300	w		w		w
	400	w	w	m	m	m	w
	500	m	m	s		m	w		w
	600	s	s	s	m	s	w
	700	m	m	m	w	m		m
	800	m	w	w		w		s
South Africa	25							m
	100							m
	200			w				w
	300			w				w
	400			m
	500	m	s	s	w		w		m
	600	s	s	s	w		w		m
	700	s	m	m		m		m
	800	w		w		w		m

Intensity of analytical bands: w: weak; m: medium, s: strong; Me: methyl group; Et: ethyl group.
^a: n-hydrocarbons.