Structural Characterisation of Asphaltenes during Residue Hydrotreatment with Light Cycle Oil as an Additive

Table 4

Definition of average structural parameters.

	definition	Equation
(H/C)ar, (H/C)sat	Hydrogen/carbon atomic ratio of aromatics or saturates
	Total hydrogen/carbon atomic ratio per average molecule
	Aromaticity factor or fraction of aromatic carbons
	Average number of carbon atoms per alkyl substituent
	Degree of aromatic substitution
	Degree of aromatic condensation
	The absolute of aromatic carbon atoms
	Total number of aromatic rings per unit sheet
	The number of aromatic structural units per unit sheet of molecules

Where H and C are area of the fitting peaks after normalization. References [29, 30].