Silicon modification of the catalyst for FCC gasoline aromatization

ZnSi/HZSM-5 aromatization catalyst was prepared by modification with silicon on the outer surface and zinc on the inner surface; its aromatization performance and resistance to carbon deposition were investigated in a laboratory-fixed reactor with the full range FCC gasoline as the feed. The modification mechanism was also discussed. The crystal phase, pore structure, acidity of the modified catalysts and the coke formed during the reaction were characterized by means of XRD, BET surface area, Py-IR and elemental analyses. The modified ZnSi/HZSM-5 aromatization catalyst exhibits a superior activity, stability and performance in reducing olefin content of FCC gasoline; under the conditions of 500°C, 1.5 MPa and a space velocity of 3.0 h−1, the mass fractions of olefins and aromatics in the upgraded gasoline are 21.75% and 27.32%, respectively.