Palladium nanoparticles stabilized by chitosan/PAAS nanofibers: A highly stable catalyst for Heck reaction. (3rd March 2020)

• Record Type: Journal Article
• Authors: Du, Yijun; Wei, Sailong; Tang, Minchao; Ye, Miaoting; Tao, Hongyu; Qi, Chenze; Shao, Linjun
• Is Part Of: Applied organometallic chemistry. Volume 34:Number 5(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-03-03
• Subjects: chitosan nanofiber -- electrospinning -- free volume -- heck reaction -- palladium nanoparticles; Organometallic chemistry -- Periodicals; Organometallic compounds -- Periodicals; 547.05
• DOI: 10.1002/aoc.5619
• Languages: English
• ISSNs: 0268-2605

Abstract

Abstract : Palladium chloride doped chitosan composite nanofibers were prepared by electrospinning with sodium polyacrylate (PAAS) as the co‐spinning agent. The composite nanofibers are subsequently treated at elevated temperature to improve their solvent resistance. The Pd (II) cations inside the composite nanofibers were reduced into uniform palladium nanoparticles (Pd NPs) with mean diameter of ~4.93 nm. These Pd NPs inside the chitosan composite nanofibers exhibited excellent catalytic activity for Heck reactions of aromatic iodides with alkenes with yields over 85%. Moreover, due to the fibrous structure, this novel fibrous palladium catalyst could be readily recovered by simple filtration and reused for 18 times without loss of initial catalytic activity. It was found that the reactants could readily diffuse from the reaction solution to the active Pd NPs inside the nanofibers and the products could departure from composite fibers into the reaction solution, while the Pd NPs were tightly restricted inside the chitosan composite nanofibers. Abstract : Uniform palladium nanoparticles were generated inside the chitosan composite nanofibers, which exhibited excellent catalytic performance for the Heck reaction. Especially, this novel fibrous catalyst could be recycled up to 18 times with little loss of initial activity.