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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Al3+离子介入提升(NH4)2SiF6对SBA-15介孔材料的水热稳定化作用
DOI: 10.1016/S1872-2067(15)60855-5, PP. 1001-1008
Keywords: SBA-15沸石介孔材料,水热稳定性,氟硅酸铵,Al3+离子引入,补硅
Abstract:
？提出了一种(NH4)2SiF6处理提高SBA-15介孔材料水热稳定性的改良方法.采用SBA-15介孔材料中预引入Al3+离子,再进行1%SiO2计量的(NH4)2SiF6处理,最后用强酸洗脱预引入的Al3+.结果显示,由此处理的SBA-15材料,其水热稳定性明显优于相同条件下未预引入Al3+时(NH4)2SiF6处理的样品.两者在800℃、100%水蒸气处理12h后,虽然均能很好保持其介观有序度、形貌及六方孔道结构,但前者的比表面积可高达271m2/g,而后者仅为224m2/g.表明Al3+离子介入能大幅度提升(NH4)2SiF6处理对SBA-15介孔材料的稳定化作用.这主要得益于预引入的骨架Al3+在保障(NH4)2SiF6处理修复SBA-15材料表面缺陷和进行表面疏水化、提升其水热稳定性的同时,能减缓(NH4)2SiF6释放的多余F-离子对SBA-15材料骨架的刻蚀破坏作用.Al3+离子介入的这种提升作用与其引入方式和SBA-15材料所经受的温度密切相关.
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