采用FT-IR,XRD,BET,TPD,元素分析及孔结构和比表面积测试等手段研究了骨架外氧化铝存在的条件下,HF处理对Hβ沸石结构和酸性的影响,并提出了HF改性机理. 结果表明,在酸处理和氟化的双重影响下,桥形羟基(3605 cm-1)、骨架外铝物种的羟基(3660 cm-1)和不稳定骨架铝物种的高频羟基(3782 cm-1)逐渐减少,而链末端Si羟基(3745 cm-1)和羟基窝附近Si羟基(3730 cm-1)逐渐增多. 同时,随着处理程度的加深,β沸石的总酸量逐渐减少并趋于稳定,强弱酸比值逐渐增大,B酸量先降后升,L酸量逐渐下降. 但是,改性程度较深时β沸石的酸性变化不大.
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