文献类型：期刊文献

英文题名：One-pot carbonization of chitosan/P123/PdCl2 blend hydrogel membranes to N-doped carbon supported Pd catalytic composites for Ullmann reactions

作者：Xu, Mengdie[1];Zhao, Jing[1];Shu, Guiqing[1];Zheng, Xiu[1];Liu, Qi[1];Wang, Yudong[1];Zeng, Minfeng[1]

机构：[1]Shaoxing Univ, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Peoples R China

年份：2019

卷号：125

起止页码：213

外文期刊名：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

收录：SCI-EXPANDED(收录号：WOS:000458222000025)、、WOS

基金：This work is supported by the National Natural Science Foundation of China (Grant No. 11475114, and 11875193), Zhejiang Provincial Fundamental Public Welfare Research Project of China (Grant No. LGG18E030004), and University Students' Science and Technology Innovation Activity Plan Project of Zhejiang Province (Grant No. 2018R432012).

语种：英文

外文关键词：Chitosan; Palladium; N-doped carbon; Catalysis

外文摘要：Novel porous nitrogen-doped carbon supported Pd (Pd@N-C) catalytic composites were prepared by one-pot thermal carbonization of chitosan/poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol)/PdCl2 (CS/P123/PdCl2) blend hydrogel membranes at different temperature in N-2 atmosphere. The porous structure of the Pd@N-C catalytic composite was governed by both the addition of P123 and the carbonization temperature. At highest carbonization temperature of 900 degrees C, the prepared Pd@N-C catalytic composite from CS/P123/PdCl2 blend membrane showed the highest specific area (S-BET) of 293.7 m(2)/g and total volume of pores (V-tot) of 0.79 cm(3)/g. The chemical state of the elements of C, N, O, Pd within the Pd@N-C catalytic composites were confirmed with X-ray photoelectron spectroscopy (XPS) measurements. Raman spectrum results showed that the prepared Pd@N-C catalytic composite contained mainly disordered carbon together with some graphite carbon. Pd nanoparticles sized in 5-20 nm dispersed well on the porous matrix of the carbon. The Pd@N-C catalytic composites showed excellent activities for the Ullmann homo-coupling reactions of aromatic halides, and can be recycled for 10 times. In such one-pot carbonization process, the polymer porogen is simultaneously decomposed without further etching and removal steps, which simplifies the preparation process and is beneficial to obtain Pd@N-C catalytic composites with desirable Pd loading. (C) 2018 Elsevier B.V. All rights reserved.