Ethanol as capping agent and formaldehyde scavenger for efficient depolymerization of lignin to aromatics
| Autor: | Tamás I. Korányi, Xiaoming Huang, Michael Boot, Emiel Emiel Hensen |
|---|---|
| Přispěvatelé: | Inorganic Materials & Catalysis |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Depolymerization
fungi Formaldehyde Lignocellulosic biomass food and beverages Pollution complex mixtures chemistry.chemical_compound chemistry Biofuel Environmental Chemistry Organic chemistry Lignin Phenol Methanol SDG 7 - Affordable and Clean Energy Deoxygenation SDG 7 – Betaalbare en schone energie |
| Zdroj: | Green Chemistry, 11(17), 4941-4950. Royal Society of Chemistry |
| ISSN: | 1463-9262 |
| DOI: | 10.1039/c5gc01120e |
| Popis: | Obtaining renewable fuels and chemicals from lignin presents an important challenge to the use of lignocellulosic biomass to meet sustainability and energy goals. We report on a thermocatalytic process for the depolymerization of lignin in supercritical ethanol over a CuMgAlOx catalyst. Ethanol as solvent results in much higher monomer yields than methanol. In contrast to methanol, ethanol acts as a scavenger of formaldehyde derived from lignin decomposition. Studies with phenol and alkylated phenols evidence the critical role of the phenolic –OH groups and formaldehyde in undesired repolymerization reactions. O-alkylation and C-alkylation capping reactions with ethanol hinder repolymerization of the phenolic monomers formed during lignin disassembly. After reaction in ethanol at 380 °C for 8 h, this process delivers high yields of mainly alkylated mono-aromatics (60–86 wt%, depending on the lignin used) with a significant degree of deoxygenation. The oxygen-free aromatics can be used to replace reformate or can serve as base aromatic chemicals; the oxygenated aromatics can be used as low-sooting diesel fuel additives and as building blocks for polymers. |
| Databáze: | OpenAIRE |
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