采用简单的离子交换法, 将Pd2+与羟基磷灰石中的Ca2+交换, 制备出含钯羟基磷灰石催化剂, 并应用于苯甲醇的绿色催化氧化反应. 通过X射线衍射(XRD)、电感耦合等离子体发射光谱(ICP-AES)、X射线光电子能谱(XPS)、场发射扫描电镜(FE-SEM)以及场发射透射电镜(FE-TEM)等手段对催化剂进行表征, 结果表明, 部分Pd进入羟基磷灰石晶格, 但未改变羟基磷灰石的晶体结构, 部分Pd以纳米颗粒的形式在HAp晶体表面析出. Pd纳米颗粒在催化剂中有高度的分散性, Pd的含量增加, 催化剂的催化效率提高, 且该催化剂对苯甲醇氧化具有较好的选择性和可重复使用性.
The PdHAp catalysts were prepared by simple ion-exchange method and calcium ions were replaced by palladium ions. As-prepared catalysts were applied for the green oxidation of benzyl alcohol. The catalysts were characterized by X-ray diffraction (XRD), inductively coupled plasma emission spectroscopy (ICP-AES), X-ray photoelectron spectroscope (XPS), field emission scanning electron microscope (FE-SEM), field emission transmission electron microscope (FE-TEM) and other techniques. The results show that some of the palladiums enter the crystal lattice of HAp, and the other palladiums were on HAp crystal surface in the form of nanoparticles. Pd nanoclusters show high dispersion of the catalysts. Palladium content is the key factor to determine catalysts’ performance. With the palladium content increasing, the catalytic efficiency was correspondingly improved. The catalysts have a good selectivity and possess excellent reusability.
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