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Carbohydr Polym. 2017 Nov 1;175:113-121. doi: 10.1016/j.carbpol.2017.07.052. Epub 2017 Jul 19.

An efficient chitosan-derived carbon/silica microspheres supported Pd catalyst with high stability for Heck reactions.

Author information

1
The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
2
The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China. Electronic address: xujianhong@tsinghua.edu.cn.

Abstract

To maintain stability and activity in Heck-coupling reaction, a novel composite carrier with controllable uniform size, high complex ability and mechanical intensity was fabricated in microchannel using natural N-doped biomolecule chitosan and silica as ingredients. Post carbonization increased its thermal stability and supported Pd@C/silica catalysts can be acquired after Pd loading. Only 2mg supported Pd@C/silica catalysts (0.44μmol) can achieve high yield (>95%) in a typical Heck-coupling reaction and maintained activity even after 8 times of recycling. This type of novel porous microspheres carrier can cut down the usage of noble Pd by avoiding the leaching as well as aggregation of Pd nanoparticles, and could be widely applied in similar chemical reactions.

KEYWORDS:

Chitosan; Heck-coupling reaction; Hierarchical porous structure; Microfluidic; Palladium

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