Abstract: Model of 10% (w) 1-hexene in FCC gasoline was used to study reactions of terminal olefins during S Zorb desulfurization process in a fixed bed reactor. The results showed that reactions of saturating and double bond isomerization could take place in the process of adsorptive desulfurization. The reaction temperature, the reaction pressure, the mole ratio of H2 to hydrocarbons and weight space velocity had significantly effects on saturating and isomerizing reactions of 1-hexene. High reaction temperature, low reaction pressure and low mole ratio of H2 to hydrocarbons promoted the double bond isomerization of olefin, such as the double bond isomerization of 1-hexene to 2-hexene and 3-hexene. Internal olefins had higher octane number and lower hydrogenation saturation activity, so the double bond isomerization of internal olefins formed by end-olefin reaction reduced the octane number loss during S Zorb desulfurization process.

Key words: S Zorb, adsorptive desulfurization, terminal olefin, saturation, double bond isomerization, octane number