【摘要】 将蔗糖、硅源与铝源混合成凝胶,在170℃下部分碳化（MI）或者在无氧环境下400℃高温碳化（MII）两种方法原位制备碳硅铝复合物,然后采用蒸汽相法辅助合成多级孔EU-1分子筛。研究表明:MI、MII均可以有效提高样品的外表面积和介孔孔容,且当m（蔗糖）/m（SiO₂）为定值时,MII的介孔化能力优于MI.MI、MII合成的样品保持一致的规律,即随着m（蔗糖）/m（SiO₂）的增多,样品的结晶度逐渐降低,外表面积和介孔孔容逐渐增大,酸量明显减小。多级孔EU-1分子筛有利于扩散,有利于提高分子筛的二甲苯异构化催化性能,其催化活性从22.99%提升到23.92%,C8芳烃选择性从89.52%提升到91.12%.更多还原

【Abstract】 The synthetic gel was prepared by mixing sucrose,silicon and aluminum,and then partially carbonized at 170 ℃ in air（MI）or carbonized at 400 ℃ in oxygen-free environment（MII）to obtain carbon-silicon-aluminum compound.The vapor phase method was adopted to synthesize hierarchical EU-1 zeolite.The research results showed that MI and MII can effectively improve the surface area and the pore volume of mesopores.When the m（sucrose）/m（SiO₂）was a fixed value,the mesoporous capacity of MII was better than that of MI.The synthetic samples by MI and MII maintain a consistent rule:with m（sucrose）/m（SiO₂）increasing,the crystallinity of the samples decreases gradually;the surface area and pore volume increase little by little;the amount of weak acid and strong acid decreases obviously.The hierarchical EU-1 zeolite is favorable for the diffusion and improved catalytic performance for xylene isomerization,with the catalytic activity increasing from 22.99% to 23.92%,C8 aromatic hydrocarbon selectivity increasing from 89.52% to 91.12%.更多还原