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首页> 外文期刊>Catalysis science & technology >Electrostatic grafting of a triphenylphosphine sulfonate on SBA-15: application in palladium catalyzed hydrogenation
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Electrostatic grafting of a triphenylphosphine sulfonate on SBA-15: application in palladium catalyzed hydrogenation

机译：三苯基膦酸在SBA-15上的静电移植：在钯催化的氢化中施用

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摘要

A novel strategy for the immobilization of a sulfonate functionalized triphenylphosphine ligand by ion-ion interactions on an irnidazolium modified SBA-15 is presented. A support containing electrostatically grafted triphenylphosphine as the ligand was reacted with PdCl2(CNPh)2 and the resulting hybrid material catalyzed olefin hydrogenation under mild conditions. The catalyst exhibits excellent activity, selectivity and stability and it can be reused for at least ten times without any loss of activity. An analogous but covalently grafted palladium system does not show any hydrogenation activity under the same conditions. TEM images of the used catalyst clearly prove the absence of palladium nanoparticles. Additionally, XPS investigations prove that palladium(0) is formed and the phosphine is oxidized. By AAS no palladium contamination down to 0.5 x 10~(-4) mmol could be detected in the products and further leaching tests verified the reaction to be truly heterogeneous. This concept of non-covalent immobilization guarantees a tight bonding of the catalytically active species to the surface in combination with a high mobility, which should be favorable for other catalyses, too.
机译：提出了一种在irnidazolium修饰的SBA-15上通过离子离子相互作用固定磺酸盐官能化三苯基配体的新型策略。含有静电移植的三苯基膦的支撑物与PDCL2（CNPH）2反应，并在轻度条件下催化烯烃氢化。催化剂表现出卓越的活性，选择性和稳定性，并且可以重复使用至少十倍，而不会损失任何活动。在相同条件下，类似但共价接枝的钯系统不会显示任何氢化活性。使用的催化剂的TEM图像清楚地证明了钯纳米颗粒的不存在。此外，XPS的研究证明了钯（0）形成并氧化。通过AAS，可以在产品中检测到低至0.5 x 10〜（-4）mmol的钯污染，进一步的浸出测试证明了反应是真正异质的。这种非共价固定化的概念可确保将催化活性物种与高迁移率结合使用，这也应有利于其他催化剂。

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