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Si-29 MAS NMR, XRD and FESEM studies of rice husk silica for the synthesis of zeolites

机译:稻壳二氧化硅合成沸石的Si-29 MAS NMR,XRD和FESEM研究

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摘要

We have used rice husk ash as a silica source for the synthesis of zeolites. Amorphous silica is a highly reactive silicon source, but not all silica which is amorphous to XRD is equally suitable. The local structure of amorphous silica was investigated by Si-29 magic-angle spinning nuclear magnetic resonance (MAS NMR) and field emission scanning electron microscopy (FESEM) in order to optimize the process. The results show that amorphous silica extracted by physical combustion with controlled temperature contains only *Si(OSi)(4) tetrahedral units and is the most reactive silica sourer in the synthesis of zeolite Y, compared to other silica samples prepared by chemical extraction and uncontrolled burning. The presence of crystalline cristobalite and trydimite phases and SiOH groups render the silica less active.
机译:我们已经使用稻壳灰作为合成沸石的二氧化硅来源。非晶态二氧化硅是高反应性的硅源,但并非所有对XRD非晶态的二氧化硅同样适用。通过Si-29魔角旋转核磁共振(MAS NMR)和场发射扫描电子显微镜(FESEM)研究了非晶态二氧化硅的局部结构,以优化工艺。结果表明,与通过化学提取和未经控制的其他二氧化硅样品相比,通过在受控温度下物理燃烧萃取的无定形二氧化硅仅包含* Si(OSi)(4)四面体单元,并且是合成沸石Y时反应性最高的二氧化硅。燃烧。结晶方石英和三方晶石相以及SiOH基团的存在使二氧化硅的活性降低。

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