【摘要】 通过优化ZSM-48分子筛的合成方案制备了低硅铝摩尔比的ZSM-48分子筛,并采用正交试验考察了铝源、碱源、模板剂、硅源、水等因素对ZSM-48分子筛合成的影响。采用XRD、XRF、SEM、N2吸附-脱附、NH3-TPD等对低硅铝摩尔比的ZSM-48分子筛进行了表征。结果表明:在合成体系中各组分的质量比m(NaOH)∶m(NaAlO2)∶m(H2O)∶m(RBr)∶m(SiO2)∶m(Seed)=1∶0.6∶90∶2.1∶17.5∶1的条件下制备的ZSM-48硅铝摩尔比达到了56.7;NH3-TPD结果表明,ZSM-48分子筛在360℃存在1个中强酸中心;SEM结果显示,低硅铝摩尔比ZSM-48是一种棒状和片状的聚结形态。更多还原

【Abstract】 Zeolite ZSM-48 with lower n(SiO2)/n(Al2O3) is prepared by optimizing the factors of synthesizing zeolite ZSM-48. The effects of the amounts of aluminum source,alkali source,template,silicon source and H2O on the preparation of ZSM-48 are investigated. The obtained zeolite ZSM-48 is characterized by XRD,XRF,SEM,N2 adsorption and NH 3-TPD. The results show that themole ratio of silicon oxide to aluminum oxide of ZSM-48 reach 56. 7. The zeolite ZSM-48 is prepared in a mass ratio of m( NaOH) ∶ m(NaAlO2) ∶ m(H2O) ∶ m( RBr) ∶ m(SiO2) ∶ m( Seed) =1∶0. 6∶90∶2. 1∶17. 5∶1. The results of NH 3-TPD indicates that ZSM-48 presentes a medium strength acid site at 360℃. And zeolite ZSM-48 with lower n( SiO2)/n(Al2O3) shows a rod-like and sheet coalescence shape.更多还原