Olefin-reduction and aromatization performance of HZSM-5 catalysts for FCC gasoline nonhydrogenation upgrading

In a nonhydrogenating circumstance,the performance of hybrid catalysts with HZSM-5 as the active component for olefin reduction and aromatization of FCC gasoline was studied.The results show that the content and n(Si)∶n(Al) of HZSM-5 displays great importance to the reaction.The catalyst 58ZSA containing HZSM-5 with 58 of n(Si)∶n(Al) and the proper mass ratio,30%,shows excellent catalytic performance for FCC gasoline upgrading.It can be concluded that it has sufficient amounts of the total acid sites and the rational distribution in the acid strengths.Further study has revealed that the optimal reaction temperature is 400℃,and the volume hourly space velocity can be 4-6 h~(-1),adjusted according to the expected marginal value of olefins and aromatics.For the product gasoline,the olefins contents can be reduced to 8%～18% of volume ratio,and the corresponding contents of aromatics increased to 42%～35% of volume ratio.Moreover the road octane number of the product gasoline has no loss.