摘要
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.
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.
基金
This work was supported by tile National Natural Science Foundation of China （Nos. B030301 and A020601） and the State Key Laboratory of Catalytic Materials and Reaction Engineering （RIPP, SINOPEC）.
