Journal
MOLECULES
Volume 22, Issue 10, Pages -Publisher
MDPI AG
DOI: 10.3390/molecules22101625
Keywords
catalysts; heteropoly acids; lignin; wet oxidation
Funding
- Finnish Cultural Foundation
- Academy of Finland (Micatox project) [269896]
- Academy of Finland (AKA) [269896, 269896] Funding Source: Academy of Finland (AKA)
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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.
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