Characterization of Sulfides in Atmospheric Residue Fractions Using Selective Oxidation Followed by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

An improved analytical method was developed for identifying sulfide compounds from aromatic fractions in Lungu atmospheric residue (LGAR). Sulfides aromatics were selectively oxidized into sulfoxides using tetrabutyl ammonium periodate (TBAP) and identified by positive-ion Electrospray Ionization Source (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Results showed that sulfides with lower polarity LGAR could effectively ionize ESI this approach. Additionally, the mainly S1 S2 class species. The most abundant oxidation-generated O1S1 O1S2 had DBE values of 3~10 8~12, respectively. species, whose condensation degree higher than S1, likely form containing both cyclic thiophenic compounds.