Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China.
Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China.
Carbohydr Polym. 2020 Feb 15;230:115583. doi: 10.1016/j.carbpol.2019.115583. Epub 2019 Nov 7.
Novel porous chitosan/reduced graphene oxide microspheres supported Pd nanoparticles catalysts (Pd@CS/RGO) were prepared by a combination of silica nanoparticles etching and freeze-drying treatments of CS/RGO/silica/PdCl composite microspheres. The microstructure of the Pd@CS/RGO microspheres catalysts have been investigated by X-ray photo electron spectroscopy (XPS), Raman spectroscopy, high resolution transmission electron microscopy (HR-TEM), thermo-gravimetric analysis (TGA), and X-ray diffraction (XRD), etc. The results revealed that: the novel catalysts showed open porous structure; CS had good miscibility with RGO nanosheets; Pd nanoparticles were well incorporated within CS/RGO matrix; the thermal stabilities of the catalysts were improved significantly over CS. Meanwhile, the Pd@CS/RGO catalysts have been demonstrated as highly active and easily recyclable catalysts for Heck reactions. The preparation process is simple, and the structure and performance of the catalytic material can be governed by changing the mass ratios of CS/RGO/silica/PdCl and the pore-forming process conditions.
新型多孔壳聚糖/还原氧化石墨烯微球负载钯纳米粒子催化剂（Pd@CS/RGO）是通过硅纳米粒子刻蚀和冷冻干燥处理 CS/RGO/二氧化硅/钯氯复合微球制备的。采用 X 射线光电子能谱（XPS）、拉曼光谱、高分辨率透射电子显微镜（HR-TEM）、热重分析（TGA）和 X 射线衍射（XRD）等手段对 Pd@CS/RGO 微球催化剂的微观结构进行了研究。结果表明：新型催化剂呈现开放多孔结构；CS 与 RGO 纳米片具有良好的混溶性；Pd 纳米粒子很好地嵌入 CS/RGO 基体中；与 CS 相比，催化剂的热稳定性显著提高。同时，Pd@CS/RGO 催化剂在 Heck 反应中表现出很高的活性和可重复使用性。该制备过程简单，通过改变 CS/RGO/二氧化硅/钯氯的质量比和造孔过程条件，可以控制催化材料的结构和性能。
