Compound-specific isotope analyses of products from carbonization of a fluid catalytic cracking decant oil doped with ~13C-enriched 4-methyldibenzothiophene

摘要

This study presents the first combined application of ~13C labeling and isotope-ratio-monitoring gas chromatography-mass spectrometry (irmGCMS) to analyze the thermochemical transforma- tions of specific organic compounds within a complex heavy oil. Specifically, this technique was used to monitor the hydrocarbons produced during the carbonization of a fuluid catalytic cracking decant oil (FCCDO). Structural GC/MS analysis of these products has previously shown that 4-methyldibenzothiophene, ~13C-labeled at the methyl position (4-~13MDBT), undergoes methylation to form a number of polymerthyldibenzotiophenes and cleavage of its aryl-methyl bond to give dibenzothiophene (Energy Fuels 1997), 11, 623, 631).