文献类型：期刊文献

英文题名：Depolymerization and hydrodeoxygenation of lignin to aromatic hydrocarbons with a Ru catalyst on a variety of Nb-based supports

作者：Ma, Di[1];Lu, Shenglu[1];Liu, Xiaohui[1];Guo, Yong[1];Wang, Yanqin[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Res Inst Ind Catalysis, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：40

期号：4

起止页码：609

外文期刊名：CHINESE JOURNAL OF CATALYSIS

收录：;EI(收录号：20191406718367);WOS:【SCI-EXPANDED(收录号:WOS:000463466100014)】；

基金：The research was sponsored financially by the National Natural Science Foundation of China (21832002, 21872050, 21808063) and the Natural Science Foundation of Shanghai (18ZR1408500).

语种：英文

外文关键词：Lignin; Aromatic hydrocarbons; Nb-based supports; Lewis acid sites; Ru

摘要：Efficient conversion of lignin to aromatic hydrocarbons via depolymerization and subsequent hydrodeoxygenation is important. Previously, we found that NbOX species played a key role in the activation and cleavage of C-O bonds in lignin and its model compounds. In this study, commercial niobic acid (HY-340), niobium phosphate (NbPO-CBMM) and lab-made layered niobium oxide (Nb2Os-Layer) were chosen as supports to study the effect of Bronsted and Lewis acids on the activation of C-O bonds in lignin conversion. A variety of Ru-loaded, Nb-based catalysts with different Ru particle sizes were prepared and applied to the conversion of p-cresol. The results show that all the Ru/Nb-based catalysts produce high mole yields of C-7-C-9 hydrocarbons (82.3%-99.1%). What's more, Ru/Nb2O5-Layer affords the best mole yield of C-7-C-9 hydrocarbons and selectivity for C-7-C-9 aromatic hydrocarbons, of up to 99.1% and 88.0%, respectively. Moreover, it was found that Lewis acid sites play important roles in the depolymerization of enzymatic lignin into phenolic monomers and the cleavage of the C-O bond of phenols. Additionally, the electronic state and particle size of Ru are significant factors which influence the selectivity for aromatic hydrocarbons. A partial positive charge on the metallic Ru surface and a smaller Ru particle size are beneficial in improving the selectivity for aromatic hydrocarbons. (C) 2019, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.