Results And Discussion

Sulfur compounds present in a typical diesel fuel were identified by a gas chromatograph coupled to a mass spectrometer (GC/MS) and a gas chromatograph with a flame photometric detector (GC/FPD) operated in the sulfur mode; they were found to be essentially C1-C4 alkyl-substituted benzothiophenes, 0-C3 alkyl-substituted dibenzothiophenes, and their isomers. Table 1 summarizes the estimated relative amount of each sulfur group in diesel fuel. The totals are 33-35% benzothiophenes and 65-67% dibenzothiophenes.

Table 1. Estimate of Relative Amount of Sulfur Groups in Diesel Fuel

Compound Class

Approximate Percentage of Total Organic Sulfur




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