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Electrocatalytic degradation of rice straw lignin in alkaline solution through oxidation on Ti/SnO2-Sb2O3/α-PbO2/β-PbO2 anode and reduction on Iron or Tin doped Titanium cathode

Abstract

A novel procedure for selective producing 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 Ti/SnO2-Sb2O3/α-PbO2/β-PbO2 anode with its oxidation potential about +1.15 V, and electro-reduction by the electro-generated chemisorbed hydrogen on the titanium-based (Iron or Tin doped Titanium) cathodes proceeded subsequently. The electro-catalysis of electrodes doped metals with catalytic activity could effectively break the chemical linkages among phenylpropyl units in rice straw lignin, and more than 16 kinds of aromatic compoundscontaining phenols, aromatic hydrocarbon, aromatic ester, aromatic ketone, aromatic acid as well as aromatic aldehyde (e.g. guaiacol, syringol, dihydroeugenol, vanillin, p-coumaric acid, ferulic acid etc.) were generated and identified utilizing GC-MSmeasurement. The operation conditions for enhancement of product yield including current density, lignin concentration, temperature and reaction time were optimized. The property of cathode materials, current density and reaction time played important roles in the electrocatalytic hydrogenation of rice straw lignin.

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Publication details

The article was received on 16 Feb 2018, accepted on 08 Aug 2018 and first published on 08 Aug 2018


Article type: Paper
DOI: 10.1039/C8CY00307F
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Electrocatalytic degradation of rice straw lignin in alkaline solution through oxidation on Ti/SnO2-Sb2O3/α-PbO2/β-PbO2 anode and reduction on Iron or Tin doped Titanium cathode

    Y. Q. Jia, Y. Wen, X. Han, J. Qi, Z. Liu, S. Zhang and G. Li, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY00307F

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