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首页> 外文期刊>RSC Advances >Facile and surfactant-free synthesis of supported Pd nanoparticles on hydrotalcite for oxidation of benzyl alcohol
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Facile and surfactant-free synthesis of supported Pd nanoparticles on hydrotalcite for oxidation of benzyl alcohol

机译：在水滑石上轻松且无表面活性剂合成负载的Pd纳米颗粒用于苯甲醇的氧化

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We report a facile modified deposition-precipitation method that permits reproducible preparation of a supported Pd catalyst with small particle size and narrow size distribution but without the protection of a surfactant and any additional treatment. The pH value in this technique plays a key role in controlling the size of the Pd nanoparticles as well as the electronic environment of the surface Pd atoms. With the increasing pH (4.0-12.0), the average size of the Pd nanoparticles decreases gradually, meanwhile, the peak area ratio for CO adsorbed on bridge-bonded Pd to that adsorbed on threefold-coordinate Pd increases. Stronger support-metal interaction (electron transfer from Pd-0 to support) is observed at pH values of 7.0 and 10.0. Both the small particle size and the electron-deficient surface metallic Pd contribute to enhancement in the activity for the solvent-free oxidation of benzyl alcohol. Therefore, compared with supported Pd catalysts prepared by sol immobilization, impregnation and deposition-precipitation methods, Pd/hydrotalcite synthesized by this modified deposition-precipitation approach shows a higher TOF value (5330 h(-1)). This enhanced catalytic performance can also be maintained in five cycles. Under the considerations of green chemistry, a number of Pd catalysts were then prepared on alternative supports using this method without the addition of alkali in the preparation process.
机译：我们报道了一种简便的改进的沉积-沉淀方法，该方法可重现制备具有小粒径和窄粒径分布的负载型Pd催化剂，但无需保护表面活性剂和进行任何其他处理。此技术中的pH值在控制Pd纳米粒子的尺寸以及表面Pd原子的电子环境中起着关键作用。随着pH值（4.0-12.0）的增加，Pd纳米粒子的平均尺寸逐渐减小，同时，桥键结合的Pd吸附的CO与三倍坐标的Pd吸附的CO的峰面积比增加。在pH值为7.0和10.0时，观察到更强的载体-金属相互作用（电子从Pd-0转移到载体）。小粒径和电子不足的表面金属Pd都有助于增强苄醇的无溶剂氧化活性。因此，与通过溶胶固定，浸渍和沉积沉淀方法制备的负载型Pd催化剂相比，通过这种改进的沉积沉淀方法合成的Pd /水滑石显示出更高的TOF值（5330 h（-1））。这种增强的催化性能也可以在五个循环中保持。在绿色化学的考虑下，然后使用该方法在替代载体上制备了许多Pd催化剂，而在制备过程中并未添加碱。

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