A series of ZSM-5 molecular sieves with different Si/Al ratios but the same crystal morphology and containing mesoporous structure are prepared through the hydrothermal crystallization method by adjusting the feed ratio.The samples are characterized by using techniques such as X-ray diffraction (XRD),X-ray fluorescence spectroscopy (XRF),scanning electron microscopy (SEM),N2 adsorption-desorption,and ammonia temperature-programmed desorption (NH3-TPD).The catalytic performance of the prepared ZSM-5 molecular sieves for butene cracking reaction is evaluated in a continuous fixed-bed micro-reactor.Study results show that as Si/Al ratio of ZSM-5 molecular sieves increases,the crystal grain size decreases from 10 μm to 2 μm gradually.As the Si/Al ratio increases from 78 to 462,the acid amount of the molecular sieves decreases from 0.925 mmol/g to 0.035 3 mmol/g.With the increasing Si/Al ratio,the conversion rate of butene decreases gradually,the selectivity of propylene rises gradually,and the selectivity of heavy products declines gradually.Stronger acidity of the catalyst leads to excessive side reactions,thus reducing the selectivity and yield of the target product.The ZSM-5 molecular sieve with a Si/Al ratio of 263 exhibits high propylene selectivity and catalytic stability in the butene cracking reaction,delivering a butene conversion rate of around 74%,a propylene selectivity of 48%,and a propylene yield of 35.5%.
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