Synthesis Of Ni-Modified ZSM-5 Zeolites and Their Catalytic Performance On N-Octane Hydroconversion

hydrophobic ZSM-5 zeolites with different nickel contents were successfully prepared by the in situ synthesis method and the impregnation method. The synthesized samples were characterized by XRD, SEM, N2 adsorption–desorption isothermals, and Py-FTIR. The characterization results show that both the textural properties and crystallization of Ni-modified ZSM-5 zeolites were preserved well, and their acidic properties can be modulated after nickel modification. The corresponding NiMo catalysts supported on Ni-modified ZSM-5 zeolites were prepared by the incipient wetness co-impregnation method, and their catalytic performances were evaluated in n-octane hydroconversion. Compared to the those modified by the in situ synthesis method, ZSM-5 zeolite-supported catalysts modified by the impregnation method exhibit higher stability and higher isomerization selectivity. This is due to the synergistic effect between Brønsted acid sites and Lewis acid sites on the Ni-modified ZSM-5 zeolites, especially for the Cracking catalyst.

In the present work, in order to introduce nickel into the micro-channels of ZSM-5 zeolites, Ni-modified ZSM-5 zeolites were prepared by two different methods. One is that the synthesized ZSM-5 zeolites, which are prepared from the method reported in the literature, were impregnated with excessive NiNO3 aqueous solution, namely, the impregnation method. In addition, ZSM-5 Zeolite Catalyst were also synthesized by the in situ synthesized method. After that, the effect of different methods on the acidic and textural properties of ZSM-5 zeolites was investigated. Finally, the catalytic performance of Ni-modified ZSM-5 zeolite-supported Zeolite ZSM-5, catalysts was evaluated in n-octane cracking reaction.

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