02016nas a2200313   4500008004100000022001400041245013600055210006900191260000800260300001100268490000800279520101300287653001901300653001101319653001401330653002801344653002201372653002001394100001601414700001801430700002101448700002101469700001901490700001301509700002201522700001301544700001301557856013201570       2022                        eng d  a0960-852400aUnraveling the reaction mechanism of selective C9 monomeric phenols formation from lignin using Pd-Al2O3-activated biochar catalyst0 aUnraveling the reaction mechanism of selective C9 monomeric phen  cJAN  a1262040 v3443 aThe 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.10aHydrogenolysis10alignin10aMechanism10aPd-Al/activated biochar10aPropanol guaiacol10aPropyl guaiacol1 aGurrala, L.1 aKumar, M., M.1 aYerrayya, Attada1 aKandasamy, Prabu1 aCastano, Pedro1 aRaja, T.1 aPilloni, Giovanni1 aPaek, C.1 aVinu, R.  uhttps://library.ncl.res.in/content/unraveling-reaction-mechanism-selective-c9-monomeric-phenols-formation-lignin-using-pd-al2o3