Journal of Analytical Methods in Chemistry

Research Article

Assessment of the Oxidative Desulfurization of Middle Distillate Surrogate Fuels with Spectroscopic Techniques

Table 5

IR absorptions of the surrogate fuels in their initial mixtures and during their oxidation. Characteristic groups that contribute to the monitoring of the oxidative process. The absorptions of the solvent, n-hexadecane, were excluded.


Characteristic groups	Mixture 1	Mixture 2	Mixture 3	Mixture 4	Mixture 5	Mixture 6	Mixture 7	Mixture 8	Mixture 9	Mixture 10	Mixture 11

IR absorptions of the surrogate fuels in their initial mixtures (cm ⁻¹ )

Tertiary group C-H bending	—	—	—	—	—	—	—	—	—	—	—

=CH- skeletal vibrations	—	—	—	—	—	—	—	—	—	—	—

C-C skeletal vibrations	1161	1161	—	1161	—	—	—	—	—	—	—

Aromatic C-H in-plane bending	1089, 1055, 1014	—	—	—	1089, 1055, 1014	1227, 1160, 1075, 1068, 1026	1227, 1160, 1075, 1068, 1026	1227, 1160, 1089, 1075, 1068, 1026	1228, 1160, 1089, 1075, 1026	1228, 1160, 1089, 1075, 1056, 1026	—

Aromatic C-H out-of-plane bending	866, 798, 760, 734	—	—	—	866, 798, 760, 734	740	740	866, 797, 760, 741	798, 760, 740	866, 848, 798, 760, 740	—

IR absorptions used to monitor the oxidation of the mixtures (cm ⁻¹ )

SO₂ symmetric stretching	—	1133	1135	1133	—	—	—	—	1133	—	1135

S=O stretching vibrations	—	1060	1061	—	—	—	—	—	—	—	1061

Aromatic C-H out-of-plane bending	760	—	—	—	760	740	740	760	—	—	—