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首页> 外文期刊>Advanced Functional Materials >CoFe_2O_4 Nanocrystals Mediated Crystallization Strategy for Magnetic Functioned ZSM-5 Catalysts
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CoFe_2O_4 Nanocrystals Mediated Crystallization Strategy for Magnetic Functioned ZSM-5 Catalysts

机译：磁性功能ZSM-5催化剂的CoFe_2O_4纳米晶体介导的结晶策略

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摘要

Zeolites have many applications in the petrochemical and fine chemical industry and their functionalization does expand the spectrum of potentials. However, the integration of functional nanocrystals into zeolite frameworks with controlled size, dispersion, and crystallization behavior still remains a significant challenge. Here, a new synthesis of magnetic functioned ZSM-5 zeolite catalysts via a CoFe2O4 nanocrystal mediated crystallization strategy is reported. It is found that high crystallinity of CoFe2O4 nanocrystals results in a well-dispersed encapsulation of them into a single-crystal of ZSM-5 due to non-further-grown nanocrystals during the fast ZSM-5 growth. On the contrary, low crystallinity of CoFe2O4 nanocrystals leads to the polycrystalline zeolite growth due to the secondary growth of nanocrystals accompanied by the zeolite crystallization and large lattice mismatch between them. The successful encapsulation of small CoFe2O4 nanocrystals (approximate to 4 nm) into single crystals lies on the preattachment of them into solid silica gel. During the growth of ZSM-5 crystals, no secondary growth of nanocrystals happens and its motion is restricted. The encapsulation of magnetic CoFe2O4 nanocrystals not only endows magnetic function into zeolites for the first time, but also does not impact catalytic performance of ZSM-5 in acetalization of cyclohexanone with methanol, which is highly promising in catalytic industries.%1802088.1-1802088.8
机译：沸石在石油化工和精细化工行业有许多应用，其功能化确实扩大了潜力。然而，将功能性纳米晶体整合到具有可控制的尺寸，分散和结晶行为的沸石骨架中仍然是一个重大挑战。在这里，报告了通过CoFe2O4纳米晶体介导的结晶策略合成的磁性功能ZSM-5沸石催化剂。发现CoFe2O4纳米晶体的高结晶度会导致它们在ZSM-5快速生长过程中由于没有进一步生长的纳米晶体而很好地分散到ZSM-5单晶中。相反，CoFe 2 O 4纳米晶体的低结晶度导致多晶沸石的生长，这是由于纳米晶体的二次生长伴随着沸石的结晶以及它们之间大的晶格失配。将小的CoFe2O4纳米晶体（约4 nm）成功封装为单晶，取决于将其预先固定到固体硅胶中。在ZSM-5晶体的生长过程中，没有发生纳米晶体的二次生长，并且其运动受到限制。磁性CoFe2O4纳米晶体的包封不仅使沸石首次具有磁性功能，而且不影响ZSM-5在环己酮与甲醇的缩醛化反应中的催化性能，这在催化工业中非常有希望。％1802088.1-1802088.8

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  • 来源
    《Advanced Functional Materials》 |2018年第32期|1802088.1-1802088.8|共8页
  • 作者

    Li Bin; Yildirim Erol; Li Wei; Qi Dianpeng; Yu Jiancan; Wei Jiaqi; Liu Zhiyuan; Sun Zhenkun; Liu Yong; Kong Biao; Xue Zhaoteng; Liu Zhuangjian; Yang Shuo-Wang; Chen Xiaodong; Zhao Dongyuan;

  • 作者单位

    Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore;

    ASTAR, Inst High Performance Comp, Singapore 138632, Singapore;

    Fudan Univ, Dept Chem, Lab Adv Mat, Shanghai 200438, Peoples R China;

    Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore;

    Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore;

    Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore;

    Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore;

    Fudan Univ, Dept Chem, Lab Adv Mat, Shanghai 200438, Peoples R China;

    Fudan Univ, Dept Chem, Lab Adv Mat, Shanghai 200438, Peoples R China;

    Fudan Univ, Dept Chem, Lab Adv Mat, Shanghai 200438, Peoples R China;

    Fudan Univ, Dept Chem, Lab Adv Mat, Shanghai 200438, Peoples R China;

    ASTAR, Inst High Performance Comp, Singapore 138632, Singapore;

    Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore;

    Fudan Univ, Dept Chem, Lab Adv Mat, Shanghai 200438, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    catalysis; crystallization; functionalization; nanocrystals; zeolites;

    机译：催化;结晶;功能化;纳米晶体;沸石;

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