Using cheap n-butylamine as template, ZSM-5 zeolites have been successfully synthesized and coated on mon- olithic interconnected macroporous Al2O3 by the secondary growth method. The use of cheap n-butylamine could significantly reduce the synthesis cost. Hierarchical monolithic ZSM-5 zeolites were prepared from synthetic mix- tures with different H2O/Na2O or SiO2/Al2O3 ratio. The synthesized samples were characterized by scanning elec- tron microscopy （SEM）, X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FT-IR） and N2 ad- sorption-desorption. The results show that the hierarchical monolithic zeolites were obtained with cheap n-butylamine template as template. During the hydrothermal reaction process, the morphology of the microme- ter-sized support was well maintained. The irregular crystals were formed in a wide range of the H2O/Na2O or SiO2/Al2O3 ratio of synthetic mixtures and coated on monolithic Al2O3. The relative crystallinity of the zeolites was highest at H2O/Na2O=250 or SiO2/Al2O3= 160. This type of composites exhibited hierarchical porous structures and relatively high specific surface areas.
Mingliang SunTianbo ZhaoJia WangZhaofei MaFengyan Li
