Unraveling the reaction mechanism of selective C9 monomeric phenols formation from lignin using Pd-Al2O3-activated biochar catalyst
| Title | Unraveling the reaction mechanism of selective C9 monomeric phenols formation from lignin using Pd-Al2O3-activated biochar catalyst |
| Publication Type | Journal Article |
| Year of Publication | 2022 |
| Authors | Gurrala, L, Kumar, MM, Yerrayya, A, Kandasamy, P, Castano, P, Raja, T, Pilloni, G, Paek, C, Vinu, R |
| Journal | Bioresource Technology |
| Volume | 344 |
| Pagination | 126204 |
| Date Published | JAN |
| Type of Article | Article |
| ISSN | 0960-8524 |
| Keywords | Hydrogenolysis, lignin, Mechanism, Pd-Al/activated biochar, Propanol guaiacol, Propyl guaiacol |
| Abstract | The conversion of biomass-derived lignin to valuable monomeric phenols at high selectivity is of paramount importance for sustainable biorefineries. In this study, a novel Pd-Al2O3 supported on activated biochar catalyst is developed for lignin hydrogenolysis. The catalyst characterization revealed that the (1 1 1) planes of both of Pd-0 and Al2O3 were exposed to the surface. The maximum lignin conversion of 70.4% along with high liquid yield (similar to 57 wt%) was obtained at 240 degrees C, 3 h and 3 MPa H-2 pressure. The total monomeric phenols yield in the liquid was 51.6 wt%, out of which C9 monomeric guaiacols constituted similar to 30.0 wt% with 38.0% selectivity to 4-propyl guaiacol. Using the reaction intermediate, coniferyl alcohol, chemoselective hydrogenation of C-alpha=C-beta is proved to occur over the Pd site, while dehydroxylation of C-gamma-OH is shown to occur over the alumina site. An impressive carbon atom economy of 60% was achieved for the production of monomeric phenols. |
| DOI | 10.1016/j.biortech.2021.126204 |
| Type of Journal (Indian or Foreign) | Foreign |
| Impact Factor (IF) | 9.642 |
Divison category:
Catalysis and Inorganic Chemistry
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