关键词: 纳米HZSM-5, 水热处理, 加氢脱硫, 烯烃饱和, 催化裂化汽油

Abstract: A series of modified nanosized HZSM-5 samples were prepared by hydrothermal treatment under various temperatures. The effects of hydrothermal treating temperatures on the structure and properties of nanosized HZSM-5 samples, such as acidity, surface area and pore volume were investigated by XRD, NH3-TPD, pyridine FT-IR and N2 adsorption/desorption techniques. The catalytic performance of these nanosized HZSM-5 samples incorporated with CoMo active components was evaluated on a continuous-flow fixed bed micro-reactor using full range FCC gasoline as feedstock. Results showed that nanosized HZSM-5 exhibited good hydrothermal stability; after hydrothermal treatment its acid amount and acid strength reduced, the interreaction of active components and support enhanced. With the increase of hydrothermal treating temperature, the hydrodesulfurization activity of the catalyst decreased, however, the olefin saturation activity decreased as well, more olefins remained in the treated gasoline. When the hydrothermal treating temperature was more than 600 ℃, the olefin saturation rate was less than 5%, so that the group compositions of the treated gasoline were basically unchanged.

Key words: nanosized HZSM-5, hydrothermal treatment, hydrodesulfurization, olefin saturation, FCC gasoline