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Crystallization Mechanism of Pure-Silica ZSM-22 in the Seed-Assistant System

机译：纯二氧化硅ZSM-22在种子辅助系统中的结晶机理

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摘要

The crystallization mechanism of pure-silica ZSM-22 was investigated in the presence of seeds. Seed crystals played a significant role in the nucleation and crystal growth. Experimental findings revealed that the seed crystals acted as a substrate for crystal crystallization, and nucleation only occurred via the interaction between the organic structure-directing agent (OSDA), 1,6-hexanedi-amine, and seed crystal surface. Oligomeric silicate species in the liquid phase as nutrients directly crystallized on the crystals. The crystal growth occurred via layer-by-layer construction on the external surface of the seed crystals. The major chemical process occurring in the crystallization process was (i) dissolution of the large seed crystals into many thin needle-like crystals, (ii) dissolution of silica particles to form oligomeric silicate species, (iii) interaction between template molecules and the crystal framework which promoted nucleation, and (iv) formation of fully crystalline pure-silica ZSM-22 via layer growth. The morphology of pure-silica ZSM-22 can be controlled by the interaction between OSDA and the crystal framework which affected crystal growth in the a- and b-orientation.
机译：在种子存在下研究了纯二氧化硅ZSM-22的结晶机理。种子晶体在成核和晶体生长中起着重要作用。实验结果表明，晶种作为晶体结晶的底物，并且仅通过有机结构 - 引导剂（OSDA），1,6-己二胺和种子晶体表面之间的相互作用发生成核。液相中的低聚硅酸盐物质作为直接在晶体上直接结晶的营养物。晶体生长在种子晶体的外表面上通过层逐层结构发生。结晶过程中发生的主要化学过程是（i）将大晶晶的溶解成许多薄的针状晶体，（ii）二氧化硅颗粒的溶解形成低聚硅酸盐物质，（III）模板分子和晶体之间的相互作用促进成核的框架，（iv）通过层生长形成完全结晶的纯二氧化硅ZSM-22。纯二氧化硅ZSM-22的形态可以通过奥达的相互作用控制，其影响A-和B型晶体生长的晶体骨架。

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  • 来源
    《Crystal growth & design》 |2018年第11期|共11页
  • 作者

    Niu Pengyu; Liu Ping; Xi Hongjuan; Lin Minggui; Wang Jungang; Chen Xiaoyan; Jia Litao; Wang Pengfei; Hou Bo; Li Debao;

  • 作者单位

    Chinese Acad Sci Inst Coal Chem State Key Lab Coal Convers Taiyuan 030001 Shanxi Peoples R China;

    Chinese Acad Sci Inst Coal Chem State Key Lab Coal Convers Taiyuan 030001 Shanxi Peoples R China;

    Chinese Acad Sci Inst Coal Chem State Key Lab Coal Convers Taiyuan 030001 Shanxi Peoples R China;

    Chinese Acad Sci Inst Coal Chem State Key Lab Coal Convers Taiyuan 030001 Shanxi Peoples R China;

    Chinese Acad Sci Inst Coal Chem State Key Lab Coal Convers Taiyuan 030001 Shanxi Peoples R China;

    Chinese Acad Sci Inst Coal Chem State Key Lab Coal Convers Taiyuan 030001 Shanxi Peoples R China;

    Chinese Acad Sci Inst Coal Chem State Key Lab Coal Convers Taiyuan 030001 Shanxi Peoples R China;

    Chinese Acad Sci Inst Coal Chem State Key Lab Coal Convers Taiyuan 030001 Shanxi Peoples R China;

    Chinese Acad Sci Inst Coal Chem State Key Lab Coal Convers Taiyuan 030001 Shanxi Peoples R China;

    Chinese Acad Sci Inst Coal Chem State Key Lab Coal Convers Taiyuan 030001 Shanxi Peoples R China;

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