Co@CoO:An efficient catalyst for the depolymerization and upgrading of lignocellulose to alkylcyclohexanols with cellulose intact  

作　　者：Shuang Xiang Lin Dong Zhiqiang Wang Xue Han Yong Guo Xiaohui Liu Xue-Qing Gong Yanqin Wang 

机构地区：[1]Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering,Feringa Nobel Prize Scientist Joint Research Center,Research Institute of Industrial Catalysis,School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China [2]Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,International Innovation Center for Forest Chemicals and Materials,Jiangsu Province Key Laboratory of Green Biomass-based Fuels and Chemicals,College of Chemical Engineering,Nanjing Forestry University,Nanjing 210037,Jiangsu,China [3]Department of Chemistry,University of Manchester,Manchester M139PL,UK

出　　处：《Journal of Energy Chemistry》2023年第2期191-199,I0006,共10页能源化学（英文版）

基　　金：supported financially by the National Natural Science Foundation of China(Nos.21832002,21808063,22002043,21872050)。

摘　　要：The depolymerization and upgrading of lignin from raw biomass,while keeping cellulose intact is important in biorefinery and various metal-based catalysts have been used in reductive catalytic fractionation,a key method in"lignin-first"strategy,Recently,we found that a core-shell structured Co@CoO catalyst with CoO shell as the real active site had excellent performance in the hydrogenolysis of 5-hydromethylfurfural to 2,5-dimethylfuran due to its unique ability to dissociate H_(2)and yield active H^(δ-)species(Xiang et al.,2022).In this work,we report a one-pot depolymerization and upgrading of lignocellulose to alkylcyclohexanols,a flavour precursor,with intact cellulose over this unique core-shell structured catalyst,[e-mail] model compounds(β-O-4,4-O-5,α-O-4)were first used to clarify the activity of Co@CoO catalyst.Then,the one-pot conversion of various organosolv lignin(birch,pine and poplar)to alkylcyclohexanols was realized with the mass yield of alkylcyclohexanols up to25.8 wt%from birch lignin under the reaction condition of 210℃,1 MPa H_(2),16 h.Finally,the corresponding woody sawdusts were used as feedstocks and found that the Co@CoO catalyst indeed preferentially depolymerized and upgraded the lignin part and obtained the same alkylcyclohexanols products with the retention of cellulose-rich pulp.The collected alkylcyclohexanols were further esterified to obtain valueadded esters,which can be used as flavors.This work will inspire the design of new efficient metal oxide catalysts in lignin fractionation and depolymerization to high-value-added chemicals with intact cellulose.

关 键 词：LIGNOCELLULOSE LIGNIN DEPOLYMERIZATION Co@CoO Alkylcyclohexanols 

分 类 号：TK6[动力工程及工程热物理—生物能] TQ426[化学工程]