Hemicelluloses supported palladium/xylan nanocomposites containing N and O ligands: Highly-performance heterogeneous catalysts for Suzuki reaction. (1st August 2019)

• Record Type: Journal Article
• Authors: Du, Fan; Zhang, Lei; Ma, Jiliang; Peng, Xinwen
• Is Part Of: Carbohydrate polymers. Volume 217(2019)
• Page Start: 224
• Page End: 231
• Publication Date: 2019-08-01
• Subjects: PACMX 1, 10-phenanthrolin-5-amine functionalized carboxymethyl xylan -- PACMX-Pd palladium grafted PACMX -- EDAX ethylenediamine functionalized xylan -- EDAX-Pd palladium grafted EDAX -- Pd NPs palladium nanoparticles -- EDC·HCl 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride -- NHS N-hydroxysuccinimide -- DBU 1, 8-diazabicyclo [5.4.0] undec-7-ene -- EtOH ethanol -- MeOH methanol -- THF tetrahydrofuran -- NaOH sodium hydroxide -- KOH potassium hydroxide -- K2CO3 potassium carbonate -- Na2CO3 sodium carbonate -- TEA triethylamine -- FT-IR fourier transform infrared spectra -- XRD X-ray powder diffraction -- XPS X-ray photoelectron spectroscopy -- TGA thermal gravimetric analysis -- TEM transmission electron microscopy -- HR-TEM high resolution transmission electron microscopy -- AAS atomic absorption spectrometer -- NMR nuclear magnetic resonance spectra -- SEM scanning electron microscope -- EDX energy dispersive X-ray spectroscopy; Biomass -- Xylan -- Palladium -- Nanocomposites -- Suzuki reaction; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2019.03.005
• Languages: English
• ISSNs: 0144-8617

Abstract

Graphical abstract: Highlights: Palladium/xylan heterogeneous catalysts containing N and O ligands were synthesized. The prepared catalysts showed excellent catalytic activity with yield up to 100%. The activity of catalysts exhibited no significant loss after recycle for 5 times. The reaction conditions are milder, compared with other palladium-based catalysts. Abstract: Two kinds of xylan/palladium catalysts (PACMX-Pd and EDAX-Pd) were simply fabricated by integrating two N bidentate ligands into the skeleton of oxygen-rich xylan and followed with the in-situ reduction of palladium. The Pd loading in PACMX-Pd and EDAX-Pd nanocomposites was 0.353 mmol/g and 0.302 mmol/g, respectively. The catalysts exhibited an excellent catalytic activity for the Suzuki reaction with a yield of high up to 100% as well as a superior turnover frequency (TOF: 9626 h −1 ). Moreover, the catalysts showed outstanding stability and could be reused for at least 5 times without significant decrease in activity. Compared with other polymers and non-polymers supported palladium catalysts, the as-prepared biomass-based catalysts possess potential applications in a wide range of organic catalysis.