Solvent effect in catalytic lignin hydrogenolysis
- The solvent effect in the catalytic depolymerization of the three-dimensional network of lignin is discussed based on recent reports in this field. Also, the results of an experimental study on the depolymerization of kraft lignin are presented. The cleavage of ether bonds within the lignin network was promoted using ruthenium and platinum on activated carbon (Ru/C and Pt/C), two common hydrogenolysis catalysts. Methanol was identified as a suitable solvent. Noteworthy, under the chosen reaction conditions, the catalysts showed significant resilience to the sulfur present in kraft lignin. The conversion of kraft lignin to lignin oil was strongly affected by the reaction conditions. Although the Ru/C catalyst provided the highest yield at supercritical conditions, a maximum yield was obtained for the Pt/C catalyst at near-critical conditions. The formation of guaiacol, 4-alkylguaiacols, isoeugenol, and 4-ethyl-2,6-dimethoxyphenol is attributed to the solubility of oligomeric lignin fragments in the solvent and the relative propensity of specific groups to adsorb on the catalyst surface.
| Author: | Dennis PankeORCiDGND, German BechtholdGND, Thomas Ernst MüllerGND |
|---|---|
| URN: | urn:nbn:de:hbz:294-102305 |
| DOI: | https://doi.org/10.3390/catal12060664 |
| Parent Title (English): | Catalysts |
| Publisher: | MDPI |
| Place of publication: | Basel, Schweiz |
| Document Type: | Article |
| Language: | English |
| Date of Publication (online): | 2023/08/25 |
| Date of first Publication: | 2022/06/17 |
| Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
| Tag: | Open Access Fonds aromatics; hydrogen; hydrogenation; hydrogenolysis; lignin; platinum catalyst; ruthenium catalyst; solvent effect; sustainability |
| Volume: | 12 |
| Issue: | 6, Article 664 |
| First Page: | 664-1 |
| Last Page: | 664-18 |
| Note: | Article Processing Charge funded by the Deutsche Forschungsgemeinschaft (DFG) and the Open Access Publication Fund of Ruhr-Universität Bochum. |
| Institutes/Facilities: | Carbon Sources and Conversion |
| Dewey Decimal Classification: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften, Maschinenbau |
| open_access (DINI-Set): | open_access |
| faculties: | Fakultät für Maschinenbau |
| Licence (English): |  Creative Commons - CC BY 4.0 - Attribution 4.0 International |
