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首页> 外文期刊>RSC Advances >Design of PNIPAAM covalently grafted on halloysite nanotubes as a support for metal-based catalysts
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Design of PNIPAAM covalently grafted on halloysite nanotubes as a support for metal-based catalysts

机译：龙脂植物在霍金纳米管上共价嫁接的设计作为金属基催化剂的载体

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摘要

A thermo-responsive polymer such as poly(N-isopropylacrylamide) (PNIPAAM) was covalently grafted on the external surface of halloysite nanotubes (HNTs) by means of microwave irradiation. This nanomaterial was used as a support and stabilizer for palladium nanoparticles. The obtained HNT-PNIPAAM/PdNPs was characterized by means of TGA, SEM, EDS and TEM analyses. The palladium content of the catalyst was estimated to be 0.4 wt%. The stability of the catalytic material at different temperatures (below and above the PNIPAAM lower critical solution temperature) was tested in the Suzuki reaction under microwave irradiation. In addition, TEM analysis after five consecutive runs was performed. The catalyst showed a good catalytic activity toward the Suzuki cross-coupling reaction between phenylboronic acid and several aryl halides in aqueous media under microwave irradiation and low palladium loading (0.016 mol%, 8 mu g of Pd). Turnover numbers (TONs) and frequencies (TOFs) up to 6250 and 37 500 h(-1), respectively, were reached. The catalyst was easily separated from the reaction mixture by centrifugation and reused for five consecutive cycles with a small drop in its catalytic activity.
机译：通过微波辐射将热响应聚合物如聚（N-异丙基丙烯酰胺）（PNIPAAM）（PNIPAAM）共价接枝在Holloysite Nanitubes（HNT）的外表面上。该纳米材料用作钯纳米颗粒的载体和稳定剂。通过TGA，SEM，EDS和TEM分析表征获得的HNT-PNIPAAM / PDNP。催化剂的钯含量估计为0.4wt％。在微波辐射下，在铃木反应中测试催化材料在不同温度下（低于和高于肺痘较低的临界溶液温度）。此外，执行了五次连续运行后的TEM分析。催化剂在微波辐射和低钯负载下致苯基硼酸与诸如水性介质中的几个芳基卤化物之间的铃木交叉偶联反应的良好催化活性。（0.016mol％，8μgpd）。达到营业额数（吨）和频率（TOOF），分别达到6250和37 500小时（-1）。通过离心将催化剂容易与反应混合物分离，并在其催化活性中重复使用5个连续循环，其催化活性小。

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  • 来源
    《RSC Advances》 |2016年第60期|共7页
  • 作者

    Massaro M.; Schembri V.; Campisciano V.; Cavallaro G.; Lazzara G.; Milioto S.; Noto R.; Parisi F.; Riela S.;

  • 作者单位

    Univ Palermo Sez Chim Dipartimento STEBICEF Viale Sci Ed 17 I-90128 Palermo Italy;

    Univ Palermo Sez Chim Dipartimento STEBICEF Viale Sci Ed 17 I-90128 Palermo Italy;

    Univ Palermo Sez Chim Dipartimento STEBICEF Viale Sci Ed 17 I-90128 Palermo Italy;

    Univ Palermo Dipartimento Fis &

    Chim Viale Sci Ed 17 I-90128 Palermo Italy;

    Univ Palermo Dipartimento Fis &

    Chim Viale Sci Ed 17 I-90128 Palermo Italy;

    Univ Palermo Dipartimento Fis &

    Chim Viale Sci Ed 17 I-90128 Palermo Italy;

    Univ Palermo Sez Chim Dipartimento STEBICEF Viale Sci Ed 17 I-90128 Palermo Italy;

    Univ Palermo Dipartimento Fis &

    Chim Viale Sci Ed 17 I-90128 Palermo Italy;

    Univ Palermo Sez Chim Dipartimento STEBICEF Viale Sci Ed 17 I-90128 Palermo Italy;

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