文献类型：期刊文献

英文题名：

Porous chitosan-derived activated N-doped carbon-supported Pd nanoparticles encaged in Al, Fe pillared montmorillonite as novel heterogeneous catalysts

作者：Zeng, Minfeng[1];Yang, Shuai[1];Chen, Yuli[1];Xu, Mengdie[1];Zhao, Jing[1];Zhang, Taojun[1];Sun, Kailang[1];Yang, Zhen[1];Zhang, Peng[2];Cao, Xingzhong[2];Wang, Baoyi[2]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Peoples R China;[2]Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

年份：2022

卷号：224

外文期刊名：APPLIED CLAY SCIENCE

收录：SCI-EXPANDED(收录号：WOS:000794808400004)、、EI(收录号：20221812056255)、Scopus(收录号：2-s2.0-85129063006)、WOS

基金：Acknowledgements The authors acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 11875193, 12175149, 11475114) , Zhejiang Provincial Fundamental Public Welfare Research Project of China (Grant No. LGG18E030004) , and Shaoxing Key Science and Technology Innovation Team Project.

语种：英文

外文关键词：Chitosan; Pillared montmorillonite; Positron annihilation

外文摘要：Novel pillared montmorillonite encaging porous chitosan derived activated N-doped carbon-supported Pd nanoparticles catalyst (Pd@Al, Fe-Mt/N-C) was synthesized by ion-exchange of the chitosan/Pd precursors into the layered-nanospaces of Al, Fe-pillared montmorillonite and subsequent confinement carbonization. N2 adsorption-desorption study indicated that the resulting nanocomposites have rich mesoporous structures. Effective encagement and in-situ reduction of Pd species led to a decrease in surface area and N2 adsorption, respectively. TEM images of the prepared Pd@Al, Fe-Mt/N-C showed that most of the Pd species with a size of 1-3 nm were well dispersed in the interlayer spaces of the pillared montmorillonite. The catalysts showed high catalytic efficiency for the Sonogashira reactions of aryl iodides or bromides with terminal aryl alkynes, and can be recycled 20 runs with no significant loss of activities. The unique encagement of the porous carbon-supported metal catalysts in the layered nanospaces of pillared montmorillonite was further elucidated by the positron annihilation spectroscopy analysis and other structural characterization methods. This layered-nanospace confinement strategy achieves a perfect combination of the advantages of activated carbon and montmorillonite as metal nanoparticle carrier.