文献类型：期刊文献

英文题名：Photocatalytic Cleavage of beta-O-4 Ether Bonds in Lignin over Ni/TiO2

作者：Chen, Changzhou[1,2,3] Liu, Peng[1,2,3] Xia, Haihong[1,2,3] Zhou, Minghao[1,2,3,4] Zhao, Jiaping[1,2,3] Sharma, Brajendra K.[4] Jiang, Jianchun[1,2,3]

第一作者：Chen, Changzhou

通信作者：Zhou, MH[1];Zhou, MH[2];Zhou, MH[3];Zhou, MH[4];Sharma, BK[4]

机构：[1]Chinese Acad Forestry, Key Lab Biomass Energy & Mat, Natl Engn Lab Biomass Chem Utilizat, SFA, Nanjing 210042, Jiangsu, Peoples R China;[2]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Key & Open Lab Forest Chem Engn, SFA, Nanjing 210042, Peoples R China;[3]Nanjing Forestry Univ, Coinnovat Ctr Efficient Proc & Utilizat Forest Re, Nanjing 210037, Peoples R China;[4]Univ Illinois, Illinois Sustainable Technol Ctr, Prairie Res Inst, One Hazelwood Dr, Champaign, IL 61820 USA

年份：2020

卷号：25

期号：9

外文期刊名：MOLECULES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000535695900105)】；

基金：Authors are grateful for the financial support from the Fundamental Research Funds of CAF (No. CAFYBB2018QB007) and the National Natural Science Foundation of China (31700645).

语种：英文

外文关键词：lignin; beta-O-4; photocatalyst; Ni/TiO2; oxidant PCC

摘要：It is of great importance to explore the selective hydrogenolysis of beta-O-4 linkages, which account for 45-60% of all linkages in native lignin, to produce valued-added chemicals and fuels from biomass employing UV light as catalyst. TiO2 exhibited satisfactory catalytic performances in various photochemical reactions, due to its versatile advantages involving high catalytic activity, low cost and non-toxicity. In this work, 20 wt.% Ni/TiO2 and oxidant PCC (Pyridinium chlorochromate) were employed to promote the cleavage of beta-O-4 alcohol to obtain high value chemicals under UV irradiation at room temperature. The Ni/TiO2 photocatalyst can be magnetically recovered and efficiently reused in the following four consecutive recycling tests in the cleavage of beta-O-4 ether bond in lignin. Mechanism studies suggested that the oxidation of beta-O-4 alcohol to beta-O-4 ketone by oxidant PCC first occurred during the reaction, and was followed by the photocatalysis of the obtained beta-O-4 ketone to corresponding acetophenone and phenol derivates. Furthermore, the system was tested on a variety of lignin model substrates containing beta-O-4 linkage for the generation of fragmentation products in good to excellent results.