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Open AccessArticle

Photocatalytic Cleavage of β-O-4 Ether Bonds in Lignin over Ni/TiO2

1
Key Lab. of Biomass Energy and Material, Jiangsu Province, National Engineering Lab. for Biomass Chemical Utilization; Key and Open Lab. on Forest Chemical Engineering, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, SFA, Nanjing 210042, China
2
Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
3
Illinois Sustainable Technology Center, Prairie Research Institute, one Hazelwood Dr., Champaign, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USA
*
Authors to whom correspondence should be addressed.
Academic Editors: Rafael Luque and Luís Adriano Santos Do Nascimento
Molecules 2020, 25(9), 2109; https://doi.org/10.3390/molecules25092109
Received: 16 April 2020 / Revised: 28 April 2020 / Accepted: 29 April 2020 / Published: 30 April 2020
(This article belongs to the Special Issue Advances in Conversion of Biomass and Waste to Chemicals and Fuels)
It is of great importance to explore the selective hydrogenolysis of β-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 β-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 β-O-4 ether bond in lignin. Mechanism studies suggested that the oxidation of β-O-4 alcohol to β-O-4 ketone by oxidant PCC first occurred during the reaction, and was followed by the photocatalysis of the obtained β-O-4 ketone to corresponding acetophenone and phenol derivates. Furthermore, the system was tested on a variety of lignin model substrates containing β-O-4 linkage for the generation of fragmentation products in good to excellent results. View Full-Text
Keywords: lignin; β-O-4; photocatalyst; Ni/TiO2; oxidant PCC lignin; β-O-4; photocatalyst; Ni/TiO2; oxidant PCC
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Chen, C.; Liu, P.; Xia, H.; Zhou, M.; Zhao, J.; Sharma, B.K.; Jiang, J. Photocatalytic Cleavage of β-O-4 Ether Bonds in Lignin over Ni/TiO2. Molecules 2020, 25, 2109.

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