NDLI: Chitosan microspheres-supported palladium species as an efficient and recyclable catalyst for Mizoroki–Heck reaction

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Chitosan microspheres-supported palladium species as an efficient and recyclable catalyst for Mizoroki–Heck reaction

Content Provider	Semantic Scholar
Author	Shao, Linjun Qi, Chenze
Copyright Year	2017
Abstract	Chitosan microspheres-supported palladium catalysts (Pd@CM) for Mizoroki–Heck reaction have been successfully prepared by electrospraying PdCl2/chitosan mixture in a trifluoroacetic acid (TFA) aqueous solution. Swelling capacity measurement and thermal analysis demonstrated that the palladium species in the chitosan microspheres could cross-link the chitosan efficiently. FT-IR spectra demonstrated that the chitosan in the microspheres could be cross-linked by glutaraldehyde, and the formed Schiff bond could chelate the palladium species efficiently. High resolution transmission electron microscopy (HR-TEM) indicated that the entrapment of palladium species in chitosan microspheres could enhance its dispersion. Mizoroki–Heck reaction catalysis results demonstrated that the catalytic activity of Pd@CM was associated with the size of chitosan microspheres. The Pd@CM with a suitable size was even more active than the catalyst with palladium species adsorbed on the surface of chitosan microspheres (Pd-CM). Moreover, the entrapment of palladium species in chitosan microspheres could reduce its aggregation and leaching in the catalysis procedure, which in turn increased the reusability of Pd@CM catalyst. The high catalytic activity and stability of Pd@CM have been attributed to the entrapment of palladium species within the cross-linked chitosan microspheres and the chelation of palladium species with the abundant amine and hydroxyl groups on chitosan chain.
Starting Page	8156
Ending Page	8165
Page Count	10
File Format	PDF HTM / HTML
DOI	10.1039/C7NJ01918A
Volume Number	41
Alternate Webpage(s)	http://www.rsc.org/suppdata/c7/nj/c7nj01918a/c7nj01918a1.pdf
Alternate Webpage(s)	https://doi.org/10.1039/C7NJ01918A
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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