Abstract: An Ag-SiO2 stationary phase was prepared and applied in solid phase extraction (SPE) technique to separate alkenes from FCC diesel fractions and coker diesel fractions. GC/MS and 1H NMR were used to characterize the types and carbon number distributions of the separated alkenes. Test results showed that normal α-olefin, internal monoolefin, diolefin and cycloolefin were the main types of alkenes in FCC diesel fractions and coker diesel fractions. The mole fraction of internal ene hydrogen in FCC diesel fractions was 80.41%, and the mole fraction of normal α-ene hydrogen in coker diesel fractions was 53.32%. The distributions of alkenes in FCC diesel fractions and coker diesel fractions were focused on C11 C15 and C12 C22, respectively.

Key words: diesel, alkene, solid phase extraction, mass spectrometry analysis, nuclear magnetic resonance