Cu 基等级孔 ZSM-5 分子筛单晶的制备及硝基苯加氢催化性能

In order to solve the problem of irreversible damage of zeolite framework in the process of intracrystalline hierarchically porous creation，a single crystal of silica-alumina zeolite ZSM-5（OMMS-ZSM-5）with hierarchically ordered macro-meso-microporous structure was successfully bottom-up in situ synthesized by using ordered macromesomicroporous carbon with anti-opal structure as a hard template，which possesses high external specific surface area（195.8 m2/g）and pore volume（0.27 cm3/g）. In addition，a series of Cu-OMMS-ZSM-5 catalysts with different Cu loadings（mass fraction：1%，5%，10%）was prepared by impregnation method using OMMS-ZSM-5 as a carrier to investigate the catalytic ability of different metal loading catalysts in the liquid-phase hydrogenation reaction of nitro⁃ benzene. The physical and chemical properties of the prepared catalysts were comprehensively characterized by SEM，TEM，XRD，NMR，N2adsorption-desorption，NH3-TPD，XPS and H2-TPR tests，which shows that the Cu elements are highly dispersed in the form of CuO，and the conversion of nitrobenzene reaches up to 96.8% and the selectivity of aniline reaches 99.3% when the loading is 9.58%（mass fraction）. Compared with the Cu-based micron ZSM-5 zeolite catalytic material，the aniline selectivity and the nitrobenzene conversion of Cu-OMMS-ZSM-5 are improved by 32.4% and 26.1%，respectively，and the high catalytic activity is maintained after three cycles.