Abstract
A compound catalyst (RA) consisted of Ni, ZnO and HZSM-5 with functions of reactive adsorption desulfurization (RADS) and olefin aromatization for fluid catalytic cracking (FCC) gasoline upgrading was prepared. X-ray powder diffraction (XRD), temperature-programmed reduction and low-temperature N2 adsorption were used to characterize the properties of the catalysts. Performance evaluation by FCC gasoline was carried out, and the result showed that the catalyst RA performed well in desulfurization and aromatization. For comparison, RADS catalyst (represented by DS) consisted of Ni and ZnO and aromatization catalyst (represented by Ar) consisted of HZSM-5 were prepared, respectively. They were combined in different ways to help investigating interaction between Ni and HZSM-5. Performance evaluated by FCC gasoline showed that catalyst RA performed best in desulfurization with a slight octane number loss. Interaction between Ni and HZSM-5 is a significant factor which influences the performance of the catalyst.
Highlights
In the light of increasingly serious air pollution caused by the use of fossil fuel, sulfur in fuels, especially gasoline and diesel, has been a hot issue of refining industry for several years
Active Ni species of RA catalyst that filling in the coupling-bed are introduced by impregnation, so Ni species can disperse well after calcination, which can contact closely with HZSM-5 to form an interactive system in atomic level
Efficient reaction lowers the chance of polymerization of olefins, carbon deposition results from olefin polymerization on catalyst can be partly inhibited, and the life of catalysts is improved. Both Ni species and HZSM-5 exist in the system at the same time in mixing-bed and separating-bed, the closely related compound system with interaction is not formed, leading to a poor aromatization performance
Summary
In the light of increasingly serious air pollution caused by the use of fossil fuel, sulfur in fuels, especially gasoline and diesel, has been a hot issue of refining industry for several years. Abstract A compound catalyst (RA) consisted of Ni, ZnO and HZSM-5 with functions of reactive adsorption desulfurization (RADS) and olefin aromatization for fluid catalytic cracking (FCC) gasoline upgrading was prepared.
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