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晶种诱导高结晶度Beta沸石的合成
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摘要
目前Beta沸石的合成依然存在着模板剂用量大~(~[1-2])(TEAOH/SiO_2≥0.3)、晶化时间长~~[3](≥3d)、合成成本高等问题,大大限制了其工业应用。因此本课题以廉价的工业级硅溶胶为硅源水热合成Beta沸石,并通过加入晶种降低模板剂用量。实验结果表明,在TEAOH/SiO_2为0.1的条件下,外加10wt%SiO_2质量的Beta沸石晶种,150℃下晶化24h即可得到结晶度良好的纯相Beta沸石;延长晶化时间至36h,与商业Beta沸石相比,产物相对结晶度可达122%;SEM图片表明产物晶粒形貌为六面体,粒径在300nm左右;~(27)Al MAS NMR数据则表明产物相对于商业Beta沸石具有明显较高百分比的四配位骨架铝。
The application of Beta zeolite has been largely limited due to the large amount of template,long crystallization period,high preparation cost,etc.In this research,the production cost of zeolite was decreased with the industrial silicasol as silicon source and the addition of seed to reduce the template amount.The experiment indicates that high-crystallinity zeolite was prepared under the condition of TEAOH/SiO_2=0.1,seed/SiO_2=0.1,150℃,24 h.With increasing the crystallization period to 36 h,the crystallinity of product is 122%times than that of industrial Beta zeolite(Fig.1).The SEM image in Fig.2 shows that the morphology of Beta Zeolite is hexahedron with the partical size of approximate 300 nm.The ~(27)Al MAS NMR spectra(Fig.3) indicate that the producing zeolite possesses more amount Al~(Ⅳ) than that of commercial zeolite.
引文
[1]Kuechl,D.E.;Benin,A.I.;Knight,L.M.Micropor.Mesopor.Mater.,2010,127:104.
    [2]Moller,K.;Yilmaz,B.;Jacubinas,R.M.;M(u|¨)ller,U.J.Am.Chem.Soc,2011,133:5284.
    [3]Zhang,Q.;Ming,W.;Ma,J,;Zhang,J.J.Mater.Chem.A,2014,2:8712.

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