丙烯在ZSM-5沸石上齐聚反应的研究 Ⅰ. 模板剂用量对丙烯齐聚反应的影响

ZSM-5 zeolites synthesized with varying the concentration of n-butylamine in gel were studied. The samples were characterized by XRD, SEM and BET surface area measurements. Under synthetic condition of this study, the range of optimum concentration of n-NBA(NBA/SiO2) is from 0.67 to 0.22, the relative crystallinity of ZSM-5 zeolites synthesized is over 90%. As template concentration decreased, particle size and BET surface area of ZSM-5 zeolites decreased. The acidity was measured by temperature-programmed desorption (TPD) of ammonia. It was found that the number of strong acid sites decreased almost linearly with the concentration of template. Propene oligomerization reaction was carried out over the samples to evaluate the catalytic properties of ZSM-5 zeolites. The template concentration affected significantly on catalytic activities of the ZSM-5 zeolites. ZSM-5 zeolites synthesized with varying the concentration of n-butylamine form 0.67 to 0.22 in gel showed better catalytic activities and stability.