Chitosan modified Ti-PILC supported PdOx catalysts for coupling reactions of aryl halides with terminal alkynes

Xiu Zheng; Jing Zhao; Qi Liu; Mengdie Xu; Shuai Yang; Minfeng Zeng; Chenze Qi; Xingzhong Cao; Baoyi Wang

doi:10.1016/j.ijbiomac.2020.04.203

Chitosan modified Ti-PILC supported PdO_x catalysts for coupling reactions of aryl halides with terminal alkynes

Int J Biol Macromol. 2020 Apr 27:158:67-74. doi: 10.1016/j.ijbiomac.2020.04.203. Online ahead of print.

Authors

Xiu Zheng¹, Jing Zhao¹, Qi Liu¹, Mengdie Xu¹, Shuai Yang¹, Minfeng Zeng², Chenze Qi¹, Xingzhong Cao³, Baoyi Wang⁴

Affiliations

¹ Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China.
² Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China. Electronic address: zengmf@usx.edu.cn.
³ Institute of High Energy Physics, The Chinese Academy of Science, Beijing 100049, China. Electronic address: caoxzh@ihep.ac.cn.
⁴ Institute of High Energy Physics, The Chinese Academy of Science, Beijing 100049, China.

PMID: 32348863
DOI: 10.1016/j.ijbiomac.2020.04.203

Abstract

Biopolymer of chitosan (CS) and titanium pillared clays (Ti-PILCs) have been combined in a hybrid as advanced supports for immobilization of PdO_x=0,1 species to prepare novel PdO_x=0,1@Ti-PILC/CS nano-composite catalysts. The Ti-PILC materials showed high specific surface areas and abundant meso-porous structure with many irregular pore channels caused by collapses of layered structure of clay during Ti pillaring process. Both CS chains and sub-nano sized PdO_x particles were successfully incorporated into the pore channels of Ti-PILC, resulting in a decrease in both the specific surface areas and uniform distribution of pore size. Besides conventional methods characterizations, the strong interactions between PdO_x species and Ti-PILC/CS support were further evidenced with positron annihilation lifetime spectroscopy studies. The resultant PdO_x@Ti-PILC/CS catalyst was highly active for the coupling reactions of aryl halides with phenyl acetylenes. It was recyclable and gave excellent yield up to 13 runs with low leaching of Pd species.

Keywords: Chitosan; Hybrid catalysts; Positron annihilation.