A hierarchical beta zeolite synthesized by quasi-solid phase conversion method was characterized by BET.scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction(XRD).temperature-programmed desorption of ammonia(NH_3-TPD),^(27)AI and ^(29)Si magic angle spinning nuclear magnetic resonance(^(27)Al and ^(29)Si MAS NMR),and its catalytic performance was compared with that of conventional microporous beta zeolite for liquid phase transalkylation of multi-secbutylbenzenes(MSBBs)with benzene.The results indicate that the hierarchical beta zeolite consists of nanosized crystals with a meso,microporous structure and has stronger acid strength than the microporous beta zeolite.The higher conversion of tri-secbutylbenzene(TSBB) and selectivity of sec-butylbenzene(SBB) are achieved on hierarchical beta zeolite than microporous beta zeolite,while the conversion of di-secbutylbenzene(DSBB) is slightly higher.The improvement of catalytic performance over hierarchical beta zeolite can be ascribed to the presence of mesopores,nanosized crystals and stronger acidity.
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