Abstract：In order to increase n-heptane into a single-chain or multi-branched isoparaffin with a higher octane number to improve the octane number and combustion efficiency of the gasoline component The ZSM-22-M-R-2 zeolite and ZSM-22-C zeolite have been synthesized using ball milling-recrystallization method and conventional hydrothermal method respectively. Then Pt-loaded catalysts were prepared by impregnation treatment for comparison of catalytic performance in hydroisomerization of n-Heptane which was hypothesized for production of isomers with high octane number. As-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), nitrogen adsorption, ammonia temperature-programmed desorption (NH3-TPD) and pyridine adsorption infrared spectroscopy (Py-IR) for the elucidation of relationship between catalytic properties and structural characteristic and acidity. Research was conducted over bench-scale fixed-bed reactor and results showed that Pt/ZSM-22-M-R-2 with smaller crystal size has higher reactivity and selectivity in hydroisomerization of n-Heptane compared with Pt/ZSM-22-C, meanwhile they have similar acid amount. The highest attainable isomerization yield of 68% was obtained when reaction temperature was set to 300 ℃.
Ba Yulei,Yue Tao,Zhou Xinggui et al. Synthesis of Hierarchical HZSM-22 and its Catalytic Properties in n-Heptane Hydroisomerization[J]. 化学反应工程与工艺, 2018, 34(2): 130-137.
