Electrocatalytic degradation of rice straw lignin in alkaline solution through oxidation on a Ti/SnO2-Sb2O3/α-PbO2/β-PbO2 anode and reduction on an iron or tin doped titanium cathode

A novel procedure for selective production of biomass-based compounds by electrochemical conversion has been developed in this work. At ambient pressure and mild temperature, rice straw lignin dissolved in sodium hydroxide solution was directly electro-oxidized on the surface of a Ti/SnO 2 -Sb 2 O 3...

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Bibliographic Details
Published in:Catalysis science & technology 2018, Vol.8 (18), p.4665-4677
Main Authors: Jia, Yongqiang, Wen, Yeqian, Han, Xiao, Qi, Jian, Liu, Zhihua, Zhang, Songmei, Li, Gang
Format: Article
Language:English
Subjects:
Anodes
Antimony trioxide
Aromatic compounds
Catalysis
Cathodes
Current density
Electrode materials
Ferulic acid
Hydrogen reduction
Hydrogen storage
Iron
Lead oxides
Lignin
Organic chemistry
Oxidation
Phenols
Pressure
Reaction time
Reduction
Sodium hydroxide
Straw
Tin dioxide
Titanium
Vanillin
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Summary:A novel procedure for selective production of biomass-based compounds by electrochemical conversion has been developed in this work. At ambient pressure and mild temperature, rice straw lignin dissolved in sodium hydroxide solution was directly electro-oxidized on the surface of a Ti/SnO 2 -Sb 2 O 3 /α-PbO 2 /β-PbO 2 anode, and subsequently, electro-reduction by the electro-generated chemisorbed hydrogen on the titanium-based (iron or tin doped titanium) cathodes proceeded. The electro-catalysis could effectively break the chemical linkages among phenylpropyl units in rice straw lignin, and more than 16 kinds of aromatic compounds containing phenols, aromatic hydrocarbon, aromatic ester, aromatic ketone, aromatic acid and aromatic aldehyde ( e.g. guaiacol, syringol, dihydroeugenol, vanillin, p -coumaric acid, ferulic acid, etc. ) were generated and identified utilizing GC-MS measurement. The operation conditions for the enhancement of the product yield including the current density, lignin concentration, temperature and reaction time were optimized. The results indicate that the properties of the cathode materials, current density and reaction time play important roles in the electrocatalytic hydrogenation of rice straw lignin. A novel procedure for selective production of biomass-based compounds by electrochemical conversion has been developed in this work.
ISSN:2044-4753
2044-4761
DOI:10.1039/c8cy00307f