Effect of aluminium sources on crystal size and morphology of ZSM-5 zeolite

Three kinds of aluminium sources,e.g.sodium aluminate,aluminum sulfate,aluminium isopropoxide(AIP) are used to synthesize ZSM-5 zeolites with different crystal sizes and morphology by hydrothermal method,with tetrapropylammonium hydroxide as a template.The products are inspected by X-ray diffraction and scanning electron microscopy.The results show that products synthesized with sodium aluminate and AIP as aluminium sources have smaller particle size and exhibit spherical shape,and the SiO2/Al2O3 ratios in ZSM-5 zeolite and in precursor gel are found to be consistent.While using aluminum sulfate as a aluminium source,the particle size is larger and the SiO2/Al2O3 ratios in ZSM-5 zeolite are lower than that in precursor gel.