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首页> 外文期刊>RSC Advances >Comparative study on different strategies for synthesizing all-silica DD3R zeolite crystals with a uniform morphology and size
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Comparative study on different strategies for synthesizing all-silica DD3R zeolite crystals with a uniform morphology and size

机译：用均匀形态和尺寸合成全硅DD3R沸石晶体的不同策略的比较研究

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摘要

In the last three decades, the all-silica deca-dodecasil 3R (DD3R) zeolite has been extensively studied as a significant potential class of porous materials in adsorptive separations. However, the use of most existing synthesis methods is unable to produce pure DD3R crystals with a uniform morphology and size. The present research, is therefore intended to provide a facile protocol to synthesize pure DD3R crystals with a controllable morphology and size and with a high reproducibility and productivity. Special attention was focused on investigating the effects of the type of seeds and the mineralizing reagent on the phase-purity, morphology, and crystal size of the resultant DD3R crystals. Various techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), N(2)adsorption-desorption at 77 K, and thermogravimetric analysis (TGA) were then used to characterize the synthesized samples. The results show that by adding a small amount of "amorphous" DD3R or "amorphous" ZSM-58 seeds, the pure DD3R crystals with a uniform morphology and size can be synthesized using 1-adamantanamine (1-ADA) as a structure-directing agent (SDA), KF was used as a mineralizing reagent, and LUDOX AS-30 as a silicon source at 443 K for 1 d. In addition, the pure, large and uniform hexahedron DD3R crystals can be prepared using fumed silica as seeds, although the crystallization time takes a longer period of 3 d. The present work could stimulate fundamental research and industrial applications of the all-silica DD3R zeolite.
机译：在过去的三十年中，全二氧化硅Deca-DoDecasil 3R（DD3R）沸石已被广泛地研究了吸附分离中的显着潜在的多孔材料类。然而，使用大多数现有的合成方法不能产生具有均匀形态和尺寸的纯DD3R晶体。因此，本研究旨在提供容易方案，以合成具有可控形态和尺寸的纯DD3R晶体，具有高再现性和生产率。特别注意研究种子类型和矿化试剂对所得DD3R晶体的相纯度，形态和晶体尺寸的影响。然后，然后使用各种技术，例如X射线衍射（XRD），扫描电子显微镜（SEM），N（2）吸附 - 解吸在77k，以及热重分析（TGA），表征合成样品。结果表明，通过加入少量的“无定形”DD3R或“无定形”ZSM-58种子，可以使用1-亚氨基甲胺（1-ADA）作为结构引导来合成具有均匀形态和尺寸的纯DD3R晶体代理（SDA），KF用作矿化试剂，Ludox As-30作为443k的硅源1 d。此外，纯，大均匀均匀的六面体DD3R晶体可以使用气相二氧化硅作为种子制备，尽管结晶时间需要较长的3d。目前的作品可以刺激全二氧化硅DD3R沸石的基本研究和产业应用。

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  • 来源
    《RSC Advances》 |2020年第46期|共8页
  • 作者

    Peng Anna; Lu Xinqing; Ma Rui; Fu Yanghe; Wang Shuhua; Zhu Weidong;

  • 作者单位

    Zhejiang Normal Univ Inst Adv Fluorine Containing Mat Zhejiang Engn Lab Green Syntheses &

    Applicat Fluo Jinhua 321004 Zhejiang Peoples R China;

    Zhejiang Normal Univ Inst Adv Fluorine Containing Mat Zhejiang Engn Lab Green Syntheses &

    Applicat Fluo Jinhua 321004 Zhejiang Peoples R China;

    Zhejiang Normal Univ Inst Adv Fluorine Containing Mat Zhejiang Engn Lab Green Syntheses &

    Applicat Fluo Jinhua 321004 Zhejiang Peoples R China;

    Zhejiang Normal Univ Inst Adv Fluorine Containing Mat Zhejiang Engn Lab Green Syntheses &

    Applicat Fluo Jinhua 321004 Zhejiang Peoples R China;

    Zhejiang Juhua Technol Ctr Co Ltd Natl Engn Technol Res Ctr Fluoro Mat Quthou 324004 Peoples R China;

    Zhejiang Normal Univ Inst Adv Fluorine Containing Mat Zhejiang Engn Lab Green Syntheses &

    Applicat Fluo Jinhua 321004 Zhejiang Peoples R China;

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