文献类型：期刊文献

英文题名：Formic acid fractionation towards highly efficient cellulose-derived PdAg bimetallic catalyst for H-2 evolution

作者：Yu, Yanyan[1,2] Xu, Huanghui[1] Yu, Hongfei[1] Hu, Lihong[3] Liu, Yun[1]

第一作者：Yu, Yanyan

通信作者：Liu, Y[1]

机构：[1]Beijing Univ Chem Technol, Coll Life Sci & Technol, Beijing Key Lab Bioproc, Beijing 100029, Peoples R China;[2]Beijing Zest Bridge Media Technol Inc, Beijing 100176, Peoples R China;[3]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Peoples R China

年份：2022

卷号：7

期号：1

起止页码：172-183

外文期刊名：GREEN ENERGY & ENVIRONMENT

收录：;EI(收录号：20211410160385);Scopus(收录号：2-s2.0-85103343698);WOS:【SCI-EXPANDED(收录号:WOS:000740432800003)】；

基金：This study was financially funded by the National Natural Science Foundation of China (NSFC, 21476016; 21776009), and Fundamental Research Funds for the Central Universities. The authors also acknowledge the special project for the construction of innovative province in Hunan Province of China (2019NK2031-3) The authors acknowledge professor Wensheng Qin, from Lakehead University of Canada, for checking English writing of revised manuscript.

语种：英文

外文关键词：Formic acid fractionation; Cellulose modification; Cellulose-derived PdAg bimetallic catalyst; Hydrogen generation; Mechanism

摘要：The present work, in which cellulose isolated from formic acid fractionation (FAC) is decorated with polyetherimide (PEI) to attain highly efficient cellulose-derived PdAgbimetallic catalyst (PdAg-PEI-FAC), has been investigated, and the catalyst properties are characterized by XRD, XPS, BET, ICP-AES and HAADF-STEM. The as-obtained Pd3.75Ag3.75-PEI-FAC exhibits excellent catalytic performance for H2 evolution from a sodium formate-free formic acid (FA) aqueous medium at ambient temperature and the turnover frequency (TOF) reaches a high value of 2875 h-1, which is superior to most of the previously reported Pd-based heterogeneous catalysts supported on a carbon matrix in the literature. The remarkable catalytic activities of PdAg-PEI-FAC result from high dispersion Pd and synergistic effects between the PdAg bimetallic system. Furthermore, the amide (-NH) group in PEI coated on cellulose acting as a proton scavenger efficiently improves the catalytic property of catalyst. In addition, the critical factors affecting H2 release, such as FA concentration, reaction temperature, PdAg compositions and support matrix type, are also evaluated. Based on the experimental results, the probable three-step mechanism of H2 evolution from FA over Pd3.75Ag3.75-PEI-FAC is proposed. In the end, the activation energy (Ea) of Pd3.75Ag3.75-PEI-FAC catalyst is calculated to 53.97 kJ mol-1, and this catalyst shows unique robustness and satisfactory re-usability with no loss of catalytic activity after five recycles. The findings in this work provide a novel routine from lignocellulose fractionation towards cellulose-derived catalyst for H2 evolution. (c) 2020 Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).