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首页> 美国卫生研究院文献>Materials >Preparation of Palladium-Supported Periodic Mesoporous Organosilicas and their Use as Catalysts in the Suzuki Cross-Coupling Reaction
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Preparation of Palladium-Supported Periodic Mesoporous Organosilicas and their Use as Catalysts in the Suzuki Cross-Coupling Reaction

机译：钯负载的周期性介孔有机硅的制备及其在铃木交叉偶联反应中的催化剂应用

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摘要

Three periodic mesoporous materials, i.e., two organosilicas with either ethylene or phenylene bridges and one silica, have been used as supports for Pd nanoparticles. All Pd-supported samples (1.0 wt%) were prepared by the incipient wetness method and subsequently reduced in an H2 stream at 200 °C. Both hydrogen chemisorption and temperature programmed reduction experiments revealed significant differences depending on the support. Pd2+ species were more reducible on the mesoporous organosilicas than on their silica counterpart. Also, remarkable differences on the particle morphology were observed by transmission electron microscopy. All Pd-supported samples were active in the Suzuki cross-coupling reaction between bromobenzene and phenylboronic acid.
机译：三种周期性的介孔材料，即两种具有乙烯或亚苯基桥的有机二氧化硅和一种二氧化硅，已被用作Pd纳米粒子的载体。通过初期润湿法制备所有Pd负载的样品（1.0wt％），随后在200℃的H 2流中还原。氢化学吸附和程序升温还原实验均显示出显着差异，具体取决于载体。在介孔有机二氧化硅上，Pd 2 + 物种的还原性要强于其对应的二氧化硅。另外，通过透射电子显微镜观察到颗粒形态上的显着差异。所有Pd负载的样品在溴苯与苯基硼酸之间的Suzuki交叉偶联反应中均具有活性。

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