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首页> 外文期刊>RSC Advances >A magnetically recyclable superparamagnetic silica supported Pt nanocatalyst through a multi-carboxyl linker: synthesis, characterization, and applications in alkene hydrosilylation
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A magnetically recyclable superparamagnetic silica supported Pt nanocatalyst through a multi-carboxyl linker: synthesis, characterization, and applications in alkene hydrosilylation

机译：通过多羧基接头：合成，表征和烯烃氢化硅烷化的合成，表征和应用，磁性可回收的超顺磁性二氧化硅支持Pt纳米催化剂

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摘要

To simplify separation procedures, improve the reusability and decrease the loss of Pt, two Pt catalysts anchored on superparamagnetic silica (Fe3O4@SiO2-EDTA@Pt and Fe3O4@SiO2-DTPA@Pt) were prepared for the first time. The stable magnetic properties made them easily recyclable using a magnet rather than filtration, decantation or centrifugation. After 12 catalytic runs for both 30-50 nm Pt catalysts, the yield of 1-heptylmethyldichlorosilane was still up to 90%. The average loss of Pt in each reaction was only 0.87% for Fe3O4@SiO2-EDTA@Pt and 0.66% for Fe3O4@SiO2-DTPA@Pt owing to the strong interaction between Pt and carboxyl. The unprecedented activity and selectivity of the two Pt nanoparticle catalysts were observed in the hydrosilylation of alkenes. The turnover number in the reaction between 1-hexene and methyldichlorosilane using 5 x 10(-8) mol of the Pt approached 662733 for Fe3O4@SiO2-EDTA@Pt and 579947 for Fe3O4@SiO2-DTPA@Pt over 12 h. The corresponding hydrosilylation products in excellent yields were obtained when we employed a broad range of alkenes as substrates, including 5 isomerous hexenes and 14 important industry raw materials. Fe3O4@SiO2-DTPA@Pt showed a better activity. They have potential for catalyzing more reactions and replacing the current homogeneous Pt catalysts in industry.
机译：为了简化分离程序，提高可重用性并降低Pt的损失，第一次锚定在超顺磁性二氧化硅上的Pt催化剂（Fe3O4 @ SiO 2-EDTA @ Pt和Fe3O4 -DTPA @ Pt）。稳定的磁性使它们容易使用磁铁而不是过滤，倾析或离心再循环。在30-50nm Pt催化剂的12次催化术后，1-庚二甲基二氯硅烷的产率仍高达90％。由于Pt和羧基之间的强相互作用，每次反应中Pt在每次反应中的Pt的平均损失仅为0.87％，对于Fe3O4 -SiO2-DTPA @ Pt。在烯烃的氢化硅烷化中观察到两个Pt纳米颗粒催化剂的前所未有的活性和选择性。使用5×10（-8）摩尔PT的1-己烯和甲基二氯硅烷之间的变出数在Fe3O4-EDTA @ Pt和579947的Fe3O4 @ SiO2-DTPA @ Pt超过12小时。当我们使用广泛的烯烃作为基材时，获得相应的氢化硅烷化产物以优异的产率获得，包括5种异常的己烯和14个重要的工业原料。 Fe3O4 @ SiO2-DTPA @ PT显示了更好的活动。它们具有催化更多反应并在工业中替代目前均相PT催化剂的可能性。

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  • 来源
    《RSC Advances》 |2019年第22期|共14页
  • 作者

    Li Laiming; Li Youxin; Yan Jincong; Cao Hang; Shao Dongyun; Bao James J.;

  • 作者单位

    Tianjin Univ Collaborat Innovat Ctr Chem Sci &

    Engn Tianjin Key Lab Modern Drug Delivery &

    High Effic Sch Pharmaceut Sci &

    Technol Room 412-8 Bldg 24 92 Weijin Rd Tianjin 300037 Peoples R China;

    Tianjin Univ Collaborat Innovat Ctr Chem Sci &

    Engn Tianjin Key Lab Modern Drug Delivery &

    High Effic Sch Pharmaceut Sci &

    Technol Room 412-8 Bldg 24 92 Weijin Rd Tianjin 300037 Peoples R China;

    Tianjin Univ Collaborat Innovat Ctr Chem Sci &

    Engn Tianjin Key Lab Modern Drug Delivery &

    High Effic Sch Pharmaceut Sci &

    Technol Room 412-8 Bldg 24 92 Weijin Rd Tianjin 300037 Peoples R China;

    Tianjin Univ Collaborat Innovat Ctr Chem Sci &

    Engn Tianjin Key Lab Modern Drug Delivery &

    High Effic Sch Pharmaceut Sci &

    Technol Room 412-8 Bldg 24 92 Weijin Rd Tianjin 300037 Peoples R China;

    Tianjin Univ Collaborat Innovat Ctr Chem Sci &

    Engn Tianjin Key Lab Modern Drug Delivery &

    High Effic Sch Pharmaceut Sci &

    Technol Room 412-8 Bldg 24 92 Weijin Rd Tianjin 300037 Peoples R China;

    Tianjin Univ Collaborat Innovat Ctr Chem Sci &

    Engn Tianjin Key Lab Modern Drug Delivery &

    High Effic Sch Pharmaceut Sci &

    Technol Room 412-8 Bldg 24 92 Weijin Rd Tianjin 300037 Peoples R China;

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