HZSM-5/Hβ复合分子筛的正辛烷临氢异构化和芳构化性能

Bifunctional catalysts (M/C) were prepared by impregnating different metals (M) on composite zeolite (C) of HZSM5 and Hβ with different acidities and pore sizes. The physicochemical characteristics of the supports and catalysts were characterized by XRD, NH3TPD and physical adsorption. The catalytic performance of M/C in hydroisomerization and hydroaromatization was evaluated in a microreactor with octane as model compound. The results showed that the composite zeolite C had appropriate distribution of acidity which was beneficial to isomerization and aromatization of octane. The hydrogenation active sites could be offered and the Bronsted and Lewis acid distribution in the catalysts could be adjusted by the modification with metal like Ni, which could enhance the hydroisomerization and hydroaromatization of octane. The hydroisomerization and hydroaromatization behavior depended also on the reaction conditions and the optimized conditions were 320℃， 2.8MPa and LHSV of 2.0h－1.