文献类型：期刊文献

英文题名：Catalytic Hydrogenolysis of Lignin into Propenyl-monophenol over Ru Single Atoms Supported on CeO₂ with Rich Oxygen Vacancies

作者：Zhang, Kaili[1,2] Jiang, Jianchun[1,2] Liu, Zhe[1] Ye, Jun[2] Tao, Ran[2] Xu, Hao[2] Xie, Jingcong[2] Yang, Jing[2] Zhao, Jian[2] Zhang, Ning[2] Wang, Kui[2]

第一作者：Zhang, Kaili

通信作者：Zhang, KL[1];Jiang, JC[1];Zhang, KL[2];Jiang, JC[2];Wang, K[2]

机构：[1]Nanjing Forestry Univ, Coll Chem Engn, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat Fo, Int Innovat Ctr Forest Chem & Mat, Nanjing 210037, Peoples R China;[2]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat Fo, Key Lab Biomass Energy & Mat, Nanjing 210042, Jiangsu, Peoples R China

年份：2024

卷号：14

期号：21

起止页码：16115-16126

外文期刊名：ACS CATALYSIS

收录：;EI(收录号：20244517316884);Scopus(收录号：2-s2.0-85207948722);WOS:【SCI-EXPANDED(收录号:WOS:001338293000001)】；

基金：This work was supported financially by National Key Research and Development Program of China (2022YFB4201904), the National Natural Science Foundation of China (32222058), and the Research Start-up Funding of Nanjing Forestry University (163030305). We thank Beijing Synchrotron Radiation Facility (BSRF) for the X-ray absorption fine structure measurements.

语种：英文

外文关键词：single-atom catalyst; oxygen vacancy; lignin; hydrogenolysis; C-O bond cleavage

摘要：Lignin is the most abundant aromatic source of natural products, but developing efficient catalysts to depolymerize it into valuable monophenol with high yield and unique selectivity remains a challenge. Herein, we report a Ru single-atom catalyst (SAC) supported on rod CeO2 with oxygen vacancies (Ov) for the depolymerization of birch dioxane acidolysis lignin (DAL). A near-theoretical maximum monophenol yield (14.8 wt %) with good selectivity to 4-n-propenyl guaiacol (51.4%), as well as high catalyst stability, was achieved. The calculated turnover (TON) was 387 mol(aromatics)/mol(Ru), which is 55x higher than that of the Ru/C catalyst. The possible reaction for this catalyst was proposed by studying a series of lignin model compounds and in situ DRIFT measurements. The mechanism involves the cleavage of C-alpha-OH and C-beta-O bonds to produce coniferyl alcohol, followed by the removal of gamma-OH to generate 4-n-propenyl guaiacol. The effects of some key parameters like solvent, Ru content, temperature, reaction time, and H-2 pressure were also investigated in terms of monophenol yields and average molecular weight. This work provides an economically feasible method for the depolymerization of lignin into highly valuable monophenols.