Journal
CHEMCATCHEM
Volume 5, Issue 4, Pages 977-985Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201200616
Keywords
biomass; heterogeneous catalysis; hydrogen transfer; microwave chemistry; solvent effects
Categories
Funding
- Spanish Ministry of Science and Innovation [CTQ2010-19844-C02-02]
- Spanish Ministry of Science and Innovation (Juan de la Cierva) [JCI-2011-09399]
- Spanish MICINN through the concession of a RyC contract [RYC-2009-04199]
- Consejeria de Ciencia e Innovacion, Junta de Andalucia [P10-FQM-6711]
- MICINN [CTQ2011 28954-C02-02]
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A series of hydrogen-donating solvents have been investigated in lignin depolymerisation practices by using a mild, microwave-assisted, hydrogen-free, hydrogenolytic approach promoted by the use of insitu hydrogen generating reagents with Ni10%Al-SBA-15 as a heterogeneous catalyst. Selected solvents were tetralin, isopropanol, glycerol and formic acid. Final identified products, namely bio-oil, biochar and residual lignin were characterised by using GCMS, matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry and high-performance size-exclusion chromatography to evaluate the extension of the hydrogenolytic process. Interestingly, the obtained phenolic monomeric products were found to be remarkably affected by the type of hydrogen-donating solvent, with the best results obtained with formic acid, a potentially renewable derived solvent, which unexpectedly provided no biochar as compared to a maximum of 38% obtained for tetralin. The reported protocol constitutes another step towards the development of fully sustainable and green methodologies of low environmental impact for lignin depolymerisation.
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