文献类型：期刊文献

英文题名：Palladiumimmobilized on chitosan nanofibers cross-linked by glutaraldehyde as an efficient catalyst for the Mizoroki-Heck reaction

作者：Wang, Z.[1];Xu, M.[1];Shao, L.[1];Qi, C.[1]

机构：[1]Shaoxing Univ, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Zhejiang, Peoples R China

年份：2016

卷号：57

期号：3

起止页码：354

外文期刊名：KINETICS AND CATALYSIS

收录：SCI-EXPANDED(收录号：WOS:000378076100010)、、EI(收录号：20242616348021)、Scopus(收录号：2-s2.0-84975699653)、WOS

基金：The authors thank very much for the financial support from Zhejiang Province Natural Science Foundation ( LQ14E030003).

语种：英文

外文关键词：chitosan; electrospinning; palladium; DFT calculation; Mizoroki-Heck reaction

外文摘要：Nonwoven chitosan (CS) nanofiber mats were successfully prepared by the electrospinning of the mixture of CS and poly(ethylene oxide) (PEO) in acetic acid aqueous solution. The CS/PEO fiber mats were treated with glutaraldehyde aqueous solution to stabilize fibers in solution. The concentration of glutaraldehyde is important for incorporating swelling properties in the cross-linked CS/PEO fiber mats. The cross-linked CS/PEO fibers (CCS/PEO fibers) were then used as supports for palladium catalysts in the Mizoroki-Heck reaction. The results of the study demonstrated that the catalytic activities of Pd catalyst supported on CCS/PEO fiber (Pd-CCS/PEO fiber) were highly dependent on the concentration of glutaraldehyde in the cross-linking process. Density functional theory (DFT) calculations indicated that the Schiff bond formed between CS and glutaraldehyde could reduce the energy needed to form a chelate complex between the CCS/PEO fibers and palladium active species. This in turn could decrease the activation energy of the Mizoroki-Heck reactions which occur in the presence of the Pd-CCS/PEO fiber catalysts. The optimized Pd-CCS/PEO fiber catalyst was very efficient and stable in the Mizoroki-Heck reaction of aromatic iodides with olefins.