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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

1
Laboratory of Process and Product Development, LUT School of Engineering Science, Lappeenranta University of Technology, Skinnarilankatu 34, FI-53850 Lappeenranta, Finland
2
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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Abstract

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
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MDPI and ACS Style

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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