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Influence of alkalinity on the synthesis of hierarchical LTA zeolite by using bridged polysilsesquioxane

机译:用桥接多晶硅钠喹甲酸碱基对层级LTA沸石合成的影响

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摘要

The mechanism of formation of hierarchical LTA zeolite involved the methoxyl groups of bridged polysilsesquioxane hydrolyzing into hydroxyl groups. The covalent Si-O-Si bond between silicon hydroxyl in the above solution and other silica sources forms by dehydration, avoiding phase separation. The influence of alkalinity on the synthesis of hierarchical LTA zeolites was investigated by using bridged polysilsesquioxane. XRD patterns indicate the synthesis of sodalite at the same molar composition of the hierarchical LTA zeolites without bridged polysilsesquioxane. The characterization results from TG and DTG revealed that bridged polysilsesquioxane was successfully incorporated into the as-synthesized hierarchical LTA zeolite. N-2-adsorption/desorption results proved that mesopores and the porosities of the hierarchical LTA zeolites are adjustable by a change of alkalinity. SEM images indicated that the morphologies of the hierarchical LTA zeolites changed with increasing alkalinity. The hierarchical LTA zeolites showed faster initial exchange rates of Na+ to Mg2+ compared with conventional LTA.
机译:分层LTA沸石的形成机制涉及桥桥水解成羟基的甲氧基。上述溶液中硅羟基与其他二氧化硅源之间的共价Si-O-Si键,通过脱水形式,避免相分离。通过使用桥接多晶硅晶烷研究了碱度对分层LTA沸石合成的影响。 XRD图案表明在没有桥接多晶硅硅氧烷的等级LTA沸石的相同摩尔组合物中的合成。 TG和DTG的表征结果显示,桥接多晶硅辛硅氧烷已成功掺入AS合成的等级LTA沸石中。 N-2 - 吸附/解吸结果证明了等级孔和分层LTA沸石的孔隙率可通过碱度的变化调节。 SEM图像表明,等级LTA沸石的形态随着碱度的增加而变化。与常规LTA相比,等级LTA沸石显示出较快的Na +至Mg2 +的初始汇率。

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  • 来源
    《RSC Advances》 |2019年第5期|共8页
  • 作者单位

    Taiyuan Univ Technol Res Inst Special Chem Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Res Inst Special Chem Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Res Inst Special Chem Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Res Inst Special Chem Taiyuan 030024 Shanxi Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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