文献类型：期刊文献

英文题名：Novel chitosan-based/montmorillonite/palladium hybrid microspheres as heterogeneous catalyst for Sonogashira reactions

作者：Zeng, Minfeng[1];Yuan, Xia[1,2];Zuo, Shufeng[1];Qi, Chenze[1]

机构：[1]Shaoxing Univ, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Peoples R China;[2]Ningbo Univ, Sch Mat Sci & Chem Engn, Ningbo 31521, Zhejiang, Peoples R China

年份：2015

卷号：5

期号：48

起止页码：37995

外文期刊名：RSC ADVANCES

收录：SCI-EXPANDED(收录号：WOS:000353960800006)、、EI(收录号：20151900825680)、Scopus(收录号：2-s2.0-84929492269)、WOS

基金：The authors acknowledge the financial support from the National Natural Science Foundation of China (grant number: 21203123 and 11475114), and the Academic Climbing Project for the youth academic leaders of Zhejiang Province, China (grant number: pd2013391).

语种：英文

外文关键词：Catalysts - Chitosan - Fourier transform infrared spectroscopy - Microspheres - Palladium - Thermogravimetric analysis - X ray photoelectron spectroscopy

外文摘要：The objective of this study was to develop novel chitosan-based/montmorillonite/palladium (CS/MMT/Pd) hybrid microsphere catalysts with improved properties for use in Sonogashira reactions. Interactions between a chitosan matrix and a montmorillonite nanofiller were revealed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and thermogravimetric (TG) analysis. The results confirmed the formation of the intercalation structure between CS macromolecules and MMT layers. X-ray photoelectron spectroscopy (XPS) and high resolution transmission electron microscopy (HR-TEM) analysis results showed that the Pd species of different valencies were dispersed at the nano-level in both the CS matrix and the interlayers of MMT. CS/MMT/Pd hybrid microspheres were highly active for the Sonogashira reactions of aryl iodides and alkynes at a palladium catalyst loading of 0.3 mol%. They can be recycled 10 times without a significant decrease in coupling yields. It was concluded that introducing MMT into the CS matrix will effectively improve the thermal stability and Pd leachingresistance of the hybrid microsphere catalysts. The results in this study demonstrated the great potential of such heterogeneous catalysts applied in Sonogashira reactions.