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Molecules 2017, 22(10), 1625; doi:10.3390/molecules22101625

Valorization of Lignin by Partial Wet Oxidation Using Sustainable Heteropoly Acid Catalysts

Laboratory of Process and Product Development, LUT School of Engineering Science, Lappeenranta University of Technology, Skinnarilankatu 34, FI-53850 Lappeenranta, Finland
Laboratory of Green Chemistry, LUT School of Engineering Science, Lappeenranta University of Technology, Sammonkatu 12, FI-50130 Mikkeli, Finland
Author to whom correspondence should be addressed.
Received: 12 September 2017 / Revised: 25 September 2017 / Accepted: 27 September 2017 / Published: 28 September 2017
(This article belongs to the Special Issue Lignin for Energy, Chemicals and Materials)
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The production of carboxylic acids by partial wet oxidation of alkali lignin at elevated temperatures and pressures was studied experimentally. Two different heteropoly acids, phosphotungstic acid (H3PW12O40) and phosphomolybdic acid (H3PMo12O40), were used to catalyze the oxidation of lignin under hydrothermal conditions. Factors influencing the total yield of carboxylic acids formed during the partial oxidation of lignin were investigated. Formic, acetic and succinic acids were the major products identified. Of the two catalysts used, phosphomolybdic acid gave the most promising results, with carboxylic acid yields and lignin conversions of up to 45% and 95%, respectively. View Full-Text
Keywords: catalysts; heteropoly acids; lignin; wet oxidation catalysts; heteropoly acids; lignin; wet oxidation

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Demesa, A.G.; Laari, A.; Sillanpää, M.; Koiranen, T. Valorization of Lignin by Partial Wet Oxidation Using Sustainable Heteropoly Acid Catalysts. Molecules 2017, 22, 1625.

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